{"id":2603,"date":"2025-10-23T09:51:31","date_gmt":"2025-10-23T09:51:31","guid":{"rendered":"https:\/\/brandnexusstudios.co.za\/blog\/?p=2603"},"modified":"2025-10-23T09:51:33","modified_gmt":"2025-10-23T09:51:33","slug":"react-functional-component-cheat-sheet","status":"publish","type":"post","link":"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/","title":{"rendered":"React Functional Component Cheat Sheet: 33 Proven Tips"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#React_Functional_Component_Cheat_Sheet_33_Proven_Tips\" >React Functional Component Cheat Sheet: 33 Proven Tips<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#What_you_will_get_from_this_react_functional_component_cheat_sheet\" >What you will get from this react functional component cheat sheet<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Starter_template_you_can_trust\" >Starter template you can trust<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Props_and_JSX_patterns_that_scale\" >Props and JSX patterns that scale<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Destructure_early\" >Destructure early<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Prefer_explicit_children\" >Prefer explicit children<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Compose_small_pieces\" >Compose small pieces<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#State_with_useState_you_will_actually_use\" >State with useState you will actually use<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Updater_function_prevents_stale_state\" >Updater function prevents stale state<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Compute_initial_state_lazily\" >Compute initial state lazily<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Group_related_state\" >Group related state<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Effects_with_useEffect_that_do_not_bite\" >Effects with useEffect that do not bite<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Fetch_with_cleanup_via_AbortController\" >Fetch with cleanup via AbortController<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Subscribe_and_unsubscribe_correctly\" >Subscribe and unsubscribe correctly<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Memoization_and_renders_that_stay_lean\" >Memoization and renders that stay lean<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#useMemo_for_heavy_calculations\" >useMemo for heavy calculations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#useCallback_for_stable_function_identities\" >useCallback for stable function identities<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Reactmemo_for_pure_components\" >React.memo for pure components<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Refs_and_DOM_access_without_pain\" >Refs and DOM access without pain<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#useRef_for_stable_boxes\" >useRef for stable boxes<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Context_and_reducers_for_shared_state\" >Context and reducers for shared state<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Custom_hooks_that_encapsulate_complexity\" >Custom hooks that encapsulate complexity<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Forms_that_behave_on_every_device\" >Forms that behave on every device<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Controlled_inputs_with_validation\" >Controlled inputs with validation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Debounced_inputs_for_search\" >Debounced inputs for search<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Data_fetching_without_footguns\" >Data fetching without footguns<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Error_handling_and_boundaries\" >Error handling and boundaries<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Accessibility_that_feels_invisible\" >Accessibility that feels invisible<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Styling_choices_that_play_nice_with_React\" >Styling choices that play nice with React<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Testing_that_gives_confidence\" >Testing that gives confidence<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#TypeScript_for_safer_components\" >TypeScript for safer components<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Props_and_events\" >Props and events<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Typing_children\" >Typing children<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Routing_and_lazy_loading\" >Routing and lazy loading<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#SSR_SSG_and_server_components\" >SSR, SSG, and server components<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Performance_and_page_speed_wins\" >Performance and page speed wins<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Patterns_and_anti_patterns_you_should_know\" >Patterns and anti patterns you should know<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Do\" >Do<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Avoid\" >Avoid<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Common_snippets_to_keep_handy\" >Common snippets to keep handy<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-41\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#usePrevious\" >usePrevious<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-42\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#useDebouncedValue\" >useDebouncedValue<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-43\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#useEvent_listener\" >useEvent listener<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-44\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Debugging_and_DevTools_that_save_your_day\" >Debugging and DevTools that save your day<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-45\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Team_practices_that_keep_code_clean\" >Team practices that keep code clean<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-46\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Security_basics_for_functional_components\" >Security basics for functional components<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-47\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Deployment_checklist_for_the_last_mile\" >Deployment checklist for the last mile<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-48\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Mini_cookbook_tiny_examples_you_can_paste\" >Mini cookbook: tiny examples you can paste<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-49\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Controlled_checkbox_group\" >Controlled checkbox group<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-50\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#Accessible_modal_shell\" >Accessible modal shell<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-51\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#FAQs\" >FAQs<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-52\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#What_is_a_functional_component_in_React_and_why_prefer_it\" >What is a functional component in React and why prefer it?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-53\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#How_do_I_manage_state_in_a_functional_component\" >How do I manage state in a functional component?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-54\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#When_should_I_use_useMemo_and_useCallback\" >When should I use useMemo and useCallback?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-55\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#How_do_I_type_React_functional_components_with_TypeScript\" >How do I type React functional components with TypeScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-56\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#How_do_I_fetch_data_in_a_functional_component\" >How do I fetch data in a functional component?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-57\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#What_are_the_key_accessibility_practices_for_React_components\" >What are the key accessibility practices for React components?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-58\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#How_can_I_speed_up_my_functional_components\" >How can I speed up my functional components?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-59\" href=\"https:\/\/brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\/#References\" >References<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p><!DOCTYPE html><br \/>\n<html lang=\"en\"><br \/>\n<head><br \/>\n  <meta charset=\"utf-8\"><br \/>\n  <title>React Functional Component Cheat Sheet: 33 Proven Tips<\/title><br \/>\n  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\"><br \/>\n  <meta name=\"description\" content=\"React functional component cheat sheet packed with 33 proven tips, patterns, and snippets to build faster apps with hooks, TypeScript, and performance wins.\">\n  <link rel=\"canonical\" href=\"https:\/\/www.brandnexusstudios.co.za\/blog\/react-functional-component-cheat-sheet\">\n  <script type=\"application\/ld+json\">\n  {\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"BlogPosting\",\n    \"headline\": \"React Functional Component Cheat Sheet: 33 Proven Tips\",\n    \"description\": \"React functional component 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type=\"application\/ld+json\" id=\"faq-schema\">\n  {\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n      {\n        \"@type\": \"Question\",\n        \"name\": \"What is a functional component in React and why prefer it?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"A functional component is a plain JavaScript function that returns JSX. It is preferred for its simplicity, easier testing, and first class access to hooks for state, effects, and performance improvements.\"\n        }\n      },\n      {\n        \"@type\": \"Question\",\n        \"name\": \"How do I manage state in a functional component?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"Use the useState hook for local state. For complex state or multiple related updates, use useReducer. For global state, pair Context with useReducer or a lightweight library.\"\n        }\n      },\n      {\n        \"@type\": \"Question\",\n        \"name\": \"When should I use useMemo and useCallback?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"Use useMemo to memoize expensive computations and useCallback to memoize functions passed to children. Apply them to real bottlenecks rather than everywhere.\"\n        }\n      },\n      {\n        \"@type\": \"Question\",\n        \"name\": \"How do I type React functional components with TypeScript?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"Type props with an interface or type, type events explicitly, prefer React.FC only if you need children typing, and export the typed component for better IntelliSense and safety.\"\n        }\n      },\n      {\n        \"@type\": \"Question\",\n        \"name\": \"How do I fetch data in a functional component?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"Use useEffect to kick off fetches on mount or on dependency changes, clean up with AbortController, and cache or dedupe with a data fetching library when needed.\"\n        }\n      },\n      {\n        \"@type\": \"Question\",\n        \"name\": \"What are the key accessibility practices for React components?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"Use semantic HTML, proper labels, ARIA only when needed, maintain focus order and visibility, and test with keyboard and screen readers.\"\n        }\n      },\n      {\n        \"@type\": \"Question\",\n        \"name\": \"How can I speed up my functional components?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"Profile first, then optimize renders with memo and stable callbacks, split code with React.lazy and Suspense, virtualize long lists, compress images, and enable caching.\"\n        }\n      }\n    ]\n  }\n  <\/script><br \/>\n<\/head><br \/>\n<body><\/p>\n<article>\n<header>\n<h1><span class=\"ez-toc-section\" id=\"React_Functional_Component_Cheat_Sheet_33_Proven_Tips\"><\/span>React Functional Component Cheat Sheet: 33 Proven Tips<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p><strong>By Morne de Heer<\/strong> &middot; Published by <a href=\"https:\/\/www.brandnexusstudios.co.za\" rel=\"noopener\">Brand Nexus Studios<\/a><\/p>\n<figure>\n        <img data-opt-id=876177761  fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/ml7ewxmv24ng.i.optimole.com\/w:1024\/h:1024\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:0f15bd8fbf665ba585a43e758f47ed3e\/directUpload\/React-Functional-Component-Cheat-Sheet-Feature.png\"\n             alt=\"React functional component cheat sheet overview with hooks, patterns, and code snippets\"\n             title=\"React Functional Component Cheat Sheet Feature\"\n             style=\"width:100%;height:auto;\"><figcaption>This react functional component cheat sheet highlights hooks, patterns, and performance tactics at a glance. All images are compressed for page speed.<\/figcaption><\/figure>\n<\/header>\n<section>\n<p>Looking for a practical, copy paste friendly react functional component cheat sheet that saves hours of trial and error? You are in the right place. This guide collects patterns, code snippets, and battle tested tips you can use today.<\/p>\n<p>Use this react functional component cheat sheet as your daily driver. Skim the headings, grab a snippet, and ship. Each tip is short, focused, and production safe.<\/p>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"What_you_will_get_from_this_react_functional_component_cheat_sheet\"><\/span>What you will get from this react functional component cheat sheet<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Fast patterns for props, state, effects, and refs<\/li>\n<li>Performance wins with memoization and stable callbacks<\/li>\n<li>TypeScript recipes for safer code and better DX<\/li>\n<li>Accessibility, testing, and deployment checklists<\/li>\n<li>Code you can paste without a yak shave<\/li>\n<\/ul>\n<p>If you need expert help implementing these patterns in a live project, the team at <a href=\"https:\/\/www.brandnexusstudios.co.za\/website-design-development\/\" rel=\"noopener\">Brand Nexus Studios<\/a> builds fast, accessible React websites and apps that scale.<\/p>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Starter_template_you_can_trust\"><\/span>Starter template you can trust<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Kick off a component with a clean, predictable template. This snippet anchors the react functional component cheat sheet.<\/p>\n<pre><code>import { useState, useEffect, useMemo, useCallback, useRef } from \"react\";\n\ntype Props = {\n  title: string;\n  initialCount?: number;\n  onChange?: (value: number) =&gt; void;\n};\n\nexport function Counter({ title, initialCount = 0, onChange }: Props) {\n  const [count, setCount] = useState(initialCount);\n  const ref = useRef&lt;HTMLDivElement | null&gt;(null);\n\n  const doubled = useMemo(() =&gt; count * 2, [count]);\n\n  const increment = useCallback(() =&gt; {\n    setCount(c =&gt; {\n      const next = c + 1;\n      onChange?.(next);\n      return next;\n    });\n  }, [onChange]);\n\n  useEffect(() =&gt; {\n    document.title = `${title} - ${count}`;\n    return () =&gt; {\n      \/\/ cleanup\n    };\n  }, [title, count]);\n\n  return (\n    &lt;div ref={ref}&gt;\n      &lt;h3&gt;{title}&lt;\/h3&gt;\n      &lt;p&gt;Count: {count} | Double: {doubled}&lt;\/p&gt;\n      &lt;button onClick={increment}&gt;Increment&lt;\/button&gt;\n    &lt;\/div&gt;\n  );\n}<\/code><\/pre>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Props_and_JSX_patterns_that_scale\"><\/span>Props and JSX patterns that scale<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Strong props make components predictable. This react functional component cheat sheet leans on simple rules that hold up under pressure.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Destructure_early\"><\/span>Destructure early<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>function Avatar({ src, alt = \"Avatar\", size = 40 }: {\n  src: string; alt?: string; size?: number;\n}) {\n  return &lt;img src={src} alt={alt} width={size} height={size} \/&gt;;\n}<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Prefer_explicit_children\"><\/span>Prefer explicit children<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>type CardProps = { heading: string; children: React.ReactNode };\n\nfunction Card({ heading, children }: CardProps) {\n  return (\n    &lt;section aria-labelledby=\"card-heading\"&gt;\n      &lt;h2 id=\"card-heading\"&gt;{heading}&lt;\/h2&gt;\n      &lt;div&gt;{children}&lt;\/div&gt;\n    &lt;\/section&gt;\n  );\n}<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Compose_small_pieces\"><\/span>Compose small pieces<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Composition beats inheritance. Build tiny parts and snap them together. This react functional component cheat sheet emphasizes small, focused components you can reuse in many flows.<\/p>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"State_with_useState_you_will_actually_use\"><\/span>State with useState you will actually use<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Reach for useState first. It is small, local, and fast. This react functional component cheat sheet shows the few patterns you need.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Updater_function_prevents_stale_state\"><\/span>Updater function prevents stale state<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>const [count, setCount] = useState(0);\nsetCount(c =&gt; c + 1); \/\/ safe with concurrent updates<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Compute_initial_state_lazily\"><\/span>Compute initial state lazily<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>const [value] = useState(() =&gt; expensiveInit());<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Group_related_state\"><\/span>Group related state<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>const [form, setForm] = useState({ name: \"\", email: \"\" });\nconst onChange = (e: React.ChangeEvent&lt;HTMLInputElement&gt;) =&gt;\n  setForm(f =&gt; ({ ...f, [e.target.name]: e.target.value }));<\/code><\/pre>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Effects_with_useEffect_that_do_not_bite\"><\/span>Effects with useEffect that do not bite<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Effects synchronize your component with the outside world. Use them deliberately. An effect in this react functional component cheat sheet always declares precise dependencies and cleans up.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Fetch_with_cleanup_via_AbortController\"><\/span>Fetch with cleanup via AbortController<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>useEffect(() =&gt; {\n  const ac = new AbortController();\n\n  async function load() {\n    const res = await fetch(\"\/api\/items\", { signal: ac.signal });\n    \/\/ handle response\n  }\n  load();\n\n  return () =&gt; ac.abort();\n}, []);<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Subscribe_and_unsubscribe_correctly\"><\/span>Subscribe and unsubscribe correctly<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>useEffect(() =&gt; {\n  function onResize() {\/* ... *\/}\n  window.addEventListener(\"resize\", onResize);\n  return () =&gt; window.removeEventListener(\"resize\", onResize);\n}, []);<\/code><\/pre>\n<figure>\n        <img data-opt-id=2065335703  fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/ml7ewxmv24ng.i.optimole.com\/w:1024\/h:1024\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:4cfdafdf72dc2952fd66316f505925fb\/directUpload\/useEffect-Setup-and-Cleanup-Diagram.png\"\n             alt=\"Diagram showing useEffect setup and cleanup lifecycle for a React functional component cheat sheet\"\n             title=\"useEffect Setup and Cleanup Diagram\"\n             style=\"width:100%;height:auto;\"><figcaption>Always return a cleanup function to avoid leaks and ghost listeners in your components.<\/figcaption><\/figure>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Memoization_and_renders_that_stay_lean\"><\/span>Memoization and renders that stay lean<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Premature optimization is a trap, yet wasted renders add up. This react functional component cheat sheet favors surgical memoization after profiling.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"useMemo_for_heavy_calculations\"><\/span>useMemo for heavy calculations<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>const result = useMemo(() =&gt; heavyCompute(input), [input]);<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"useCallback_for_stable_function_identities\"><\/span>useCallback for stable function identities<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>const onSelect = useCallback((id: string) =&gt; {\n  \/\/ ...\n}, []);<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Reactmemo_for_pure_components\"><\/span>React.memo for pure components<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>const ListItem = React.memo(function ListItem({ item }: { item: Item }) {\n  return &lt;li&gt;{item.name}&lt;\/li&gt;;\n});<\/code><\/pre>\n<figure>\n        <img data-opt-id=1904104516  data-opt-src=\"https:\/\/ml7ewxmv24ng.i.optimole.com\/w:1024\/h:1024\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:d0ac512f8c657ffa5332e462f87d3664\/directUpload\/Memoization-Decision-Flow.png\"  decoding=\"async\" src=\"data:image/svg+xml,%3Csvg%20viewBox%3D%220%200%201024%201024%22%20width%3D%221024%22%20height%3D%221024%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Crect%20width%3D%221024%22%20height%3D%221024%22%20fill%3D%22transparent%22%2F%3E%3C%2Fsvg%3E\"\n             alt=\"Flow chart of memoization decisions in React to complement a react functional component cheat sheet\"\n             title=\"Memoization Decision Flow\"\n             style=\"width:100%;height:auto;\"><figcaption>Profile first, then apply memo, useCallback, and useMemo where they remove real work.<\/figcaption><\/figure>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Refs_and_DOM_access_without_pain\"><\/span>Refs and DOM access without pain<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Refs give you an escape hatch to the DOM or mutable values. This react functional component cheat sheet keeps refs purposeful.<\/p>\n<pre><code>const inputRef = useRef&lt;HTMLInputElement | null&gt;(null);\nuseEffect(() =&gt; {\n  inputRef.current?.focus();\n}, []);\n\nreturn &lt;input ref={inputRef} aria-label=\"Search\" \/&gt;;<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"useRef_for_stable_boxes\"><\/span>useRef for stable boxes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Store mutable objects that do not trigger renders. Example: previous values, timers, or measuring sizes.<\/p>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Context_and_reducers_for_shared_state\"><\/span>Context and reducers for shared state<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When props drilling becomes noise, share state with Context. The react functional component cheat sheet pairs Context with useReducer for predictable updates.<\/p>\n<pre><code>type State = { theme: \"light\" | \"dark\" };\ntype Action = { type: \"toggle\" };\n\nconst ThemeContext = React.createContext&lt;[State, React.Dispatch&lt;Action&gt;] | null&gt;(null);\n\nfunction reducer(state: State, action: Action): State {\n  switch (action.type) {\n    case \"toggle\": return { theme: state.theme === \"light\" ? \"dark\" : \"light\" };\n    default: return state;\n  }\n}\n\nexport function ThemeProvider({ children }: { children: React.ReactNode }) {\n  const value = React.useReducer(reducer, { theme: \"light\" });\n  return &lt;ThemeContext.Provider value={value}&gt;{children}&lt;\/ThemeContext.Provider&gt;;\n}\n\nexport function useTheme() {\n  const ctx = React.useContext(ThemeContext);\n  if (!ctx) throw new Error(\"useTheme must be used within ThemeProvider\");\n  return ctx;\n}<\/code><\/pre>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Custom_hooks_that_encapsulate_complexity\"><\/span>Custom hooks that encapsulate complexity<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Abstract behavior, not visuals. This react functional component cheat sheet favors custom hooks that hide wiring and reveal a tiny API.<\/p>\n<pre><code>function useLocalStorage&lt;T&gt;(key: string, initial: T) {\n  const [state, setState] = useState&lt;T&gt;(() =&gt; {\n    try {\n      const raw = localStorage.getItem(key);\n      return raw ? JSON.parse(raw) as T : initial;\n    } catch {\n      return initial;\n    }\n  });\n\n  useEffect(() =&gt; {\n    try {\n      localStorage.setItem(key, JSON.stringify(state));\n    } catch {\n      \/\/ ignore quota errors\n    }\n  }, [key, state]);\n\n  return [state, setState] as const;\n}<\/code><\/pre>\n<p>Start with one custom hook per feature. Ship it, then reuse it everywhere.<\/p>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Forms_that_behave_on_every_device\"><\/span>Forms that behave on every device<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Forms are where UX succeeds or fails. In this react functional component cheat sheet, you will see patterns that feel native and stay fast.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Controlled_inputs_with_validation\"><\/span>Controlled inputs with validation<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>const [values, setValues] = useState({ email: \"\", password: \"\" });\nconst [errors, setErrors] = useState&lt;Partial&lt;typeof values&gt;&gt;({});\n\nfunction validate(v = values) {\n  const out: Partial&lt;typeof values&gt; = {};\n  if (!\/^[^@]+@[^@]+\\.[^@]+$\/.test(v.email)) out.email = \"Invalid email\";\n  if (v.password.length &lt; 8) out.password = \"Min 8 chars\";\n  return out;\n}\n\nfunction onSubmit(e: React.FormEvent) {\n  e.preventDefault();\n  const errs = validate();\n  setErrors(errs);\n  if (Object.keys(errs).length === 0) {\n    \/\/ submit\n  }\n}<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Debounced_inputs_for_search\"><\/span>Debounced inputs for search<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>const [query, setQuery] = useState(\"\");\nconst debounced = useDebouncedValue(query, 300);<\/code><\/pre>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Data_fetching_without_footguns\"><\/span>Data fetching without footguns<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Fetching data is simple to start and tricky to perfect. This react functional component cheat sheet prioritizes correctness and user feedback.<\/p>\n<pre><code>function useFetch&lt;T&gt;(url: string) {\n  const [data, setData] = useState&lt;T | null&gt;(null);\n  const [error, setError] = useState&lt;Error | null&gt;(null);\n  const [loading, setLoading] = useState(false);\n\n  useEffect(() =&gt; {\n    const ac = new AbortController();\n    setLoading(true);\n    fetch(url, { signal: ac.signal })\n      .then(r =&gt; {\n        if (!r.ok) throw new Error(`HTTP ${r.status}`);\n        return r.json() as Promise&lt;T&gt;;\n      })\n      .then(setData)\n      .catch(e =&gt; {\n        if (e.name !== \"AbortError\") setError(e);\n      })\n      .finally(() =&gt; setLoading(false));\n    return () =&gt; ac.abort();\n  }, [url]);\n\n  return { data, error, loading };\n}<\/code><\/pre>\n<p>Show skeletons, not spinners. Cancel on unmount. Cache when calls repeat often.<\/p>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Error_handling_and_boundaries\"><\/span>Error handling and boundaries<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Errors happen. Catch them early, show helpful fallbacks, and log. While error boundaries are class based today, you can wrap your functional components with a boundary and keep the rest of the tree functional. This react functional component cheat sheet keeps fallbacks simple.<\/p>\n<pre><code>function ErrorMessage({ err }: { err: Error }) {\n  return &lt;p role=\"alert\"&gt;Something went wrong: {err.message}&lt;\/p&gt;;\n}<\/code><\/pre>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Accessibility_that_feels_invisible\"><\/span>Accessibility that feels invisible<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Accessible components help all users. The react functional component cheat sheet bakes in semantics and keyboard support.<\/p>\n<ul>\n<li>Use native elements first: button, label, input, nav, main<\/li>\n<li>Connect labels with inputs via htmlFor and id<\/li>\n<li>Manage focus on route changes and modal opens<\/li>\n<li>Respect prefers-reduced-motion and color contrast<\/li>\n<\/ul>\n<pre><code>&lt;button aria-expanded={open} aria-controls=\"menu\"&gt;Menu&lt;\/button&gt;\n&lt;ul id=\"menu\" hidden={!open}&gt;...&lt;\/ul&gt;<\/code><\/pre>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Styling_choices_that_play_nice_with_React\"><\/span>Styling choices that play nice with React<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Pick one approach per project and commit. This react functional component cheat sheet works with CSS Modules, utility CSS, or CSS-in-JS.<\/p>\n<pre><code>\/\/ CSS Modules\nimport styles from \".\/Button.module.css\";\nexport function Button({ children }: { children: React.ReactNode }) {\n  return &lt;button className={styles.primary}&gt;{children}&lt;\/button&gt;;\n}<\/code><\/pre>\n<pre><code>\/\/ Utility CSS example\nexport function Tag({ label }: { label: string }) {\n  return &lt;span className=\"inline-flex items-center rounded bg-blue-100 px-2 py-1 text-blue-800\"&gt;\n    {label}\n  &lt;\/span&gt;;\n}<\/code><\/pre>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Testing_that_gives_confidence\"><\/span>Testing that gives confidence<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Test behavior, not implementation details. This react functional component cheat sheet encourages writing tests that mirror user actions.<\/p>\n<pre><code>import { render, screen } from \"@testing-library\/react\";\nimport userEvent from \"@testing-library\/user-event\";\nimport { Counter } from \".\/Counter\";\n\ntest(\"increments count\", async () =&gt; {\n  render(&lt;Counter title=\"Demo\" \/&gt;);\n  await userEvent.click(screen.getByRole(\"button\", { name: \/increment\/i }));\n  expect(screen.getByText(\/count: 1\/i)).toBeInTheDocument();\n});<\/code><\/pre>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"TypeScript_for_safer_components\"><\/span>TypeScript for safer components<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>TypeScript catches bugs before they hit the browser. This react functional component cheat sheet shows pragmatic typing.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Props_and_events\"><\/span>Props and events<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>type FormProps = {\n  onSubmit: (data: { name: string; email: string }) =&gt; void;\n};\n\nfunction SimpleForm({ onSubmit }: FormProps) {\n  const [name, setName] = useState(\"\");\n  const [email, setEmail] = useState(\"\");\n  const handleSubmit = (e: React.FormEvent&lt;HTMLFormElement&gt;) =&gt; {\n    e.preventDefault();\n    onSubmit({ name, email });\n  };\n  \/\/ ...\n}<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Typing_children\"><\/span>Typing children<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>type WithChildren&lt;P = {}&gt; = P &amp; { children?: React.ReactNode };<\/code><\/pre>\n<figure>\n        <img data-opt-id=552221557  data-opt-src=\"https:\/\/ml7ewxmv24ng.i.optimole.com\/w:1024\/h:1024\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:d0e4799f3c4d1d8db2961db5a94e13cf\/directUpload\/TypeScript-Props-IntelliSense.png\"  decoding=\"async\" src=\"data:image/svg+xml,%3Csvg%20viewBox%3D%220%200%201024%201024%22%20width%3D%221024%22%20height%3D%221024%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Crect%20width%3D%221024%22%20height%3D%221024%22%20fill%3D%22transparent%22%2F%3E%3C%2Fsvg%3E\"\n             alt=\"TypeScript IntelliSense for typed props in a react functional component cheat sheet\"\n             title=\"TypeScript Props IntelliSense\"\n             style=\"width:100%;height:auto;\"><figcaption>Type your props and events to unlock IntelliSense and safe refactoring.<\/figcaption><\/figure>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Routing_and_lazy_loading\"><\/span>Routing and lazy loading<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Split code on route boundaries and where bundles are heavy. The react functional component cheat sheet leans on React.lazy and Suspense for better TTI.<\/p>\n<pre><code>const Settings = React.lazy(() =&gt; import(\".\/Settings\"));\n\nfunction App() {\n  return (\n    &lt;React.Suspense fallback={&lt;p&gt;Loading...&lt;\/p&gt;}&gt;\n      &lt;Settings \/&gt;\n    &lt;\/React.Suspense&gt;\n  );\n}<\/code><\/pre>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"SSR_SSG_and_server_components\"><\/span>SSR, SSG, and server components<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Server rendering improves first paint and SEO. In Next.js, move data fetching server side and keep client components small. This react functional component cheat sheet focuses on client behavior while acknowledging server boundaries.<\/p>\n<p>For SEO that turns rankings into revenue, see how <a href=\"https:\/\/www.brandnexusstudios.co.za\/seo-services\/\" rel=\"noopener\">Brand Nexus Studios SEO services<\/a> can help your React build land qualified traffic.<\/p>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Performance_and_page_speed_wins\"><\/span>Performance and page speed wins<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Speed is a feature. The react functional component cheat sheet highlights the low hanging fruit you can ship today.<\/p>\n<ul>\n<li>Profile with React DevTools Profiler before optimizing<\/li>\n<li>Memoize where it cuts renders in hot paths<\/li>\n<li>Split heavy routes and components with React.lazy<\/li>\n<li>Virtualize long lists to avoid layout thrash<\/li>\n<li>Compress images aggressively and serve modern formats<\/li>\n<li>Enable caching headers and client side caching for APIs<\/li>\n<\/ul>\n<figure>\n        <img data-opt-id=93361846  data-opt-src=\"https:\/\/ml7ewxmv24ng.i.optimole.com\/w:1024\/h:1024\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:058f91a0af44d85aff3f7230afd883c7\/directUpload\/React-Performance-Optimizations-Checklist.png\"  decoding=\"async\" src=\"data:image/svg+xml,%3Csvg%20viewBox%3D%220%200%201024%201024%22%20width%3D%221024%22%20height%3D%221024%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Crect%20width%3D%221024%22%20height%3D%221024%22%20fill%3D%22transparent%22%2F%3E%3C%2Fsvg%3E\"\n             alt=\"Checklist of React performance optimizations including caching and image compression\"\n             title=\"React Performance Optimizations Checklist\"\n             style=\"width:100%;height:auto;\"><figcaption>Our images on this page are compressed and cached for faster loads on mobile and desktop.<\/figcaption><\/figure>\n<p>Bundle smarter. Preload critical assets, defer non critical scripts, and cache aggressively. A service worker or CDN can shave seconds off real users\u2019 waits.<\/p>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Patterns_and_anti_patterns_you_should_know\"><\/span>Patterns and anti patterns you should know<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Good patterns pay dividends. The react functional component cheat sheet also calls out traps to avoid.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Do\"><\/span>Do<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Lift state only when multiple children need it<\/li>\n<li>Keep components small and single purpose<\/li>\n<li>Use keys that stay stable across renders<\/li>\n<li>Co locate files by feature, not by type<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Avoid\"><\/span>Avoid<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Running effects to compute derived UI that belongs in render<\/li>\n<li>Overusing context for every bit of state<\/li>\n<li>Putting fetch logic inside many components without a common hook<\/li>\n<li>Inline object and function props that change every render when not needed<\/li>\n<\/ul>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Common_snippets_to_keep_handy\"><\/span>Common snippets to keep handy<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Bookmark this react functional component cheat sheet and grab these drop in snippets when the need hits.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"usePrevious\"><\/span>usePrevious<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>function usePrevious&lt;T&gt;(value: T) {\n  const ref = useRef&lt;T | undefined&gt;();\n  useEffect(() =&gt; { ref.current = value; }, [value]);\n  return ref.current;\n}<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"useDebouncedValue\"><\/span>useDebouncedValue<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>function useDebouncedValue&lt;T&gt;(value: T, delay = 300) {\n  const [v, setV] = useState(value);\n  useEffect(() =&gt; {\n    const t = setTimeout(() =&gt; setV(value), delay);\n    return () =&gt; clearTimeout(t);\n  }, [value, delay]);\n  return v;\n}<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"useEvent_listener\"><\/span>useEvent listener<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>function useEvent&lt;K extends keyof WindowEventMap&gt;(name: K, handler: (e: WindowEventMap[K]) =&gt; void) {\n  const saved = useRef(handler);\n  useEffect(() =&gt; { saved.current = handler; }, [handler]);\n  useEffect(() =&gt; {\n    const l = (e: WindowEventMap[K]) =&gt; saved.current(e);\n    window.addEventListener(name, l);\n    return () =&gt; window.removeEventListener(name, l);\n  }, [name]);\n}<\/code><\/pre>\n<figure>\n        <img data-opt-id=958844972  data-opt-src=\"https:\/\/ml7ewxmv24ng.i.optimole.com\/w:1024\/h:1024\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:fd0baecbf2de2adb96db62b69521d4ec\/directUpload\/Key-Hooks-Overview.png\"  decoding=\"async\" src=\"data:image/svg+xml,%3Csvg%20viewBox%3D%220%200%201024%201024%22%20width%3D%221024%22%20height%3D%221024%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Crect%20width%3D%221024%22%20height%3D%221024%22%20fill%3D%22transparent%22%2F%3E%3C%2Fsvg%3E\"\n             alt=\"Overview illustration of key React hooks for a react functional component cheat sheet\"\n             title=\"Key Hooks Overview\"\n             style=\"width:100%;height:auto;\"><figcaption>Hooks are composable. Build a tiny hook that does one thing well, then combine them.<\/figcaption><\/figure>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Debugging_and_DevTools_that_save_your_day\"><\/span>Debugging and DevTools that save your day<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Log less, inspect more. The React DevTools Profiler shows which components re render and why. This react functional component cheat sheet suggests profiling before optimizing.<\/p>\n<ul>\n<li>Highlight updates in React DevTools to spot noisy components<\/li>\n<li>Track renders by logging useRef counters in development<\/li>\n<li>Use why did you render in dev to flag wasted renders<\/li>\n<\/ul>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Team_practices_that_keep_code_clean\"><\/span>Team practices that keep code clean<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Consistency beats cleverness. The react functional component cheat sheet pairs lints and conventions with CI checks.<\/p>\n<ul>\n<li>Set ESLint with React rules and TypeScript rules<\/li>\n<li>Format with Prettier to reduce PR noise<\/li>\n<li>Run type checks and tests in CI for every PR<\/li>\n<\/ul>\n<p>Need reliable dashboards for KPIs and adoption? <a href=\"https:\/\/www.brandnexusstudios.co.za\/analytics-reporting\/\" rel=\"noopener\">Brand Nexus Studios analytics and reporting<\/a> can help you track the impact of each release.<\/p>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Security_basics_for_functional_components\"><\/span>Security basics for functional components<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Security is everyone\u2019s job. Keep it simple and consistent. This react functional component cheat sheet keeps security top of mind.<\/p>\n<ul>\n<li>Never dangerouslySetInnerHTML user input<\/li>\n<li>Escape output on the server<\/li>\n<li>Use Content Security Policy headers<\/li>\n<li>Store secrets on the server, not in JS<\/li>\n<\/ul>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Deployment_checklist_for_the_last_mile\"><\/span>Deployment checklist for the last mile<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The last 10 percent is the hardest. This react functional component cheat sheet includes a pre flight list.<\/p>\n<ol>\n<li>Run a production build and analyze bundles<\/li>\n<li>Compress images and verify caching headers<\/li>\n<li>Audit accessibility and fix violations<\/li>\n<li>Enable error reporting and performance monitoring<\/li>\n<li>Load test hot endpoints<\/li>\n<\/ol>\n<p>When you want a partner from code to cloud, <a href=\"https:\/\/www.brandnexusstudios.co.za\/\" rel=\"noopener\">Brand Nexus Studios<\/a> supports hosting, maintenance, and growth so your team can focus on product.<\/p>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"Mini_cookbook_tiny_examples_you_can_paste\"><\/span>Mini cookbook: tiny examples you can paste<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>These helpers round out the react functional component cheat sheet so you can move fast on any feature.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Controlled_checkbox_group\"><\/span>Controlled checkbox group<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>function CheckGroup({ options, value, onChange }: {\n  options: { id: string; label: string }[];\n  value: string[];\n  onChange: (next: string[]) =&gt; void;\n}) {\n  function toggle(id: string) {\n    onChange(value.includes(id) ? value.filter(x =&gt; x !== id) : [...value, id]);\n  }\n  return (\n    &lt;fieldset&gt;\n      &lt;legend&gt;Select options&lt;\/legend&gt;\n      {options.map(o =&gt; (\n        &lt;label key={o.id}&gt;\n          &lt;input type=\"checkbox\" checked={value.includes(o.id)} onChange={() =&gt; toggle(o.id)} \/&gt; {o.label}\n        &lt;\/label&gt;\n      ))}\n    &lt;\/fieldset&gt;\n  );\n}<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Accessible_modal_shell\"><\/span>Accessible modal shell<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code>function Modal({ open, onClose, children }: WithChildren&lt;{\n  open: boolean; onClose: () =&gt; void;\n}&gt;) {\n  useEffect(() =&gt; {\n    if (!open) return;\n    const onKey = (e: KeyboardEvent) =&gt; e.key === \"Escape\" &amp;&amp; onClose();\n    document.addEventListener(\"keydown\", onKey);\n    return () =&gt; document.removeEventListener(\"keydown\", onKey);\n  }, [open, onClose]);\n\n  if (!open) return null;\n  return (\n    &lt;div role=\"dialog\" aria-modal=\"true\" className=\"fixed inset-0 grid place-items-center\"&gt;\n      &lt;div className=\"fixed inset-0 bg-black\/50\" onClick={onClose} \/&gt;\n      &lt;div className=\"relative rounded bg-white p-6 shadow-lg\"&gt;\n        &lt;button aria-label=\"Close\" className=\"absolute right-2 top-2\" onClick={onClose}&gt;\u00d7&lt;\/button&gt;\n        {children}\n      &lt;\/div&gt;\n    &lt;\/div&gt;\n  );\n}<\/code><\/pre>\n<figure>\n        <img data-opt-id=2065335703  data-opt-src=\"https:\/\/ml7ewxmv24ng.i.optimole.com\/w:1024\/h:1024\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:4cfdafdf72dc2952fd66316f505925fb\/directUpload\/useEffect-Setup-and-Cleanup-Diagram.png\"  decoding=\"async\" src=\"data:image/svg+xml,%3Csvg%20viewBox%3D%220%200%201024%201024%22%20width%3D%221024%22%20height%3D%221024%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Crect%20width%3D%221024%22%20height%3D%221024%22%20fill%3D%22transparent%22%2F%3E%3C%2Fsvg%3E\"\n             alt=\"Flow of focus and escape handling in a modal for a react functional component cheat sheet\"\n             title=\"Modal Focus and Escape Handling\"\n             style=\"width:100%;height:auto;\"><figcaption>Focus management and Escape to close are non negotiable in modals.<\/figcaption><\/figure>\n<\/section>\n<section>\n<h2><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Here are quick answers to common questions that this react functional component cheat sheet keeps getting.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_a_functional_component_in_React_and_why_prefer_it\"><\/span>What is a functional component in React and why prefer it?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A functional component is a function that returns JSX. Prefer it for its simplicity, hooks support, and testability. This react functional component cheat sheet uses functions everywhere.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_do_I_manage_state_in_a_functional_component\"><\/span>How do I manage state in a functional component?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Use useState for local state and useReducer for complex transitions. For app wide state, add Context. This react functional component cheat sheet shows each pattern with minimal code.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"When_should_I_use_useMemo_and_useCallback\"><\/span>When should I use useMemo and useCallback?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Use them only where they reduce actual work. Measure first, then memoize hot spots. The react functional component cheat sheet stresses profiling over guesswork.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_do_I_type_React_functional_components_with_TypeScript\"><\/span>How do I type React functional components with TypeScript?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Define props as an interface or type, type events and refs, and use React.FC only when you need implicit children typing. This react functional component cheat sheet includes cut and paste examples.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_do_I_fetch_data_in_a_functional_component\"><\/span>How do I fetch data in a functional component?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Kick off fetches in useEffect with cleanup and surfacing loading and error states. Cache repeated calls with a fetching library when appropriate.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_are_the_key_accessibility_practices_for_React_components\"><\/span>What are the key accessibility practices for React components?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Use semantic HTML, proper labels, and manage focus. Add ARIA only when semantics are not enough.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_can_I_speed_up_my_functional_components\"><\/span>How can I speed up my functional components?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Profile, then apply memoization, split code with React.lazy, virtualize long lists, compress images, and enable caching. The react functional component cheat sheet includes a performance checklist you can follow today.<\/p>\n<\/section>\n<section id=\"references\">\n<h2><span class=\"ez-toc-section\" id=\"References\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><a href=\"https:\/\/react.dev\/reference\/react\" rel=\"noopener\" target=\"_blank\">React Hooks documentation<\/a><\/li>\n<li><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Closures\" rel=\"nofollow noopener\" target=\"_blank\">MDN Web Docs on JavaScript closures<\/a><\/li>\n<\/ul>\n<\/section>\n<footer>\n<p>Enjoyed this react functional component cheat sheet? Subscribe, drop a comment, or share it with your team. If you want hands on help, email info@brandnexusstudios.co.za and let us know what you are building.<\/p>\n<\/footer>\n<\/article>\n<p><\/body><br \/>\n<\/html><\/p>\n","protected":false},"excerpt":{"rendered":"<p>React Functional Component Cheat Sheet: 33 Proven Tips React Functional Component Cheat Sheet: 33 Proven Tips By Morne<\/p>\n","protected":false},"author":1,"featured_media":2609,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[143,5],"tags":[796,933,930,929,928,935,612,932,519,923,924,936,937,926,934,925,931,927],"class_list":["post-2603","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-business","category-digital-marketing","tag-accessibility","tag-code-splitting","tag-context-api","tag-custom-hooks","tag-functional-components","tag-jsx-patterns","tag-lazy-loading","tag-next-js","tag-performance-optimization","tag-react","tag-react-hooks","tag-react-testing","tag-reducers","tag-typescript-react","tag-usecallback","tag-useeffect","tag-usememo","tag-usestate"],"featured_image_urls":{"full":["https:\/\/ml7ewxmv24ng.i.optimole.com\/w:auto\/h:auto\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:0f15bd8fbf665ba585a43e758f47ed3e\/directUpload\/React-Functional-Component-Cheat-Sheet-Feature.png",1024,1024,false],"thumbnail":["https:\/\/ml7ewxmv24ng.i.optimole.com\/w:auto\/h:auto\/g:ce\/rt:fill\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:0f15bd8fbf665ba585a43e758f47ed3e\/directUpload\/React-Functional-Component-Cheat-Sheet-Feature.png",150,150,false],"medium":["https:\/\/ml7ewxmv24ng.i.optimole.com\/w:auto\/h:auto\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:0f15bd8fbf665ba585a43e758f47ed3e\/directUpload\/React-Functional-Component-Cheat-Sheet-Feature.png",300,300,false],"medium_large":["https:\/\/ml7ewxmv24ng.i.optimole.com\/w:auto\/h:auto\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:0f15bd8fbf665ba585a43e758f47ed3e\/directUpload\/React-Functional-Component-Cheat-Sheet-Feature.png",1024,1024,false],"large":["https:\/\/ml7ewxmv24ng.i.optimole.com\/w:auto\/h:auto\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:0f15bd8fbf665ba585a43e758f47ed3e\/directUpload\/React-Functional-Component-Cheat-Sheet-Feature.png",640,640,false],"1536x1536":["https:\/\/ml7ewxmv24ng.i.optimole.com\/w:auto\/h:auto\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:0f15bd8fbf665ba585a43e758f47ed3e\/directUpload\/React-Functional-Component-Cheat-Sheet-Feature.png",1024,1024,false],"2048x2048":["https:\/\/ml7ewxmv24ng.i.optimole.com\/w:auto\/h:auto\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:0f15bd8fbf665ba585a43e758f47ed3e\/directUpload\/React-Functional-Component-Cheat-Sheet-Feature.png",1024,1024,false],"morenews-large":["https:\/\/ml7ewxmv24ng.i.optimole.com\/w:auto\/h:auto\/g:ce\/rt:fill\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:0f15bd8fbf665ba585a43e758f47ed3e\/directUpload\/React-Functional-Component-Cheat-Sheet-Feature.png",825,575,false],"morenews-medium":["https:\/\/ml7ewxmv24ng.i.optimole.com\/w:auto\/h:auto\/g:ce\/rt:fill\/cb:5G8L.116b\/ig:avif\/q:mauto\/id:0f15bd8fbf665ba585a43e758f47ed3e\/directUpload\/React-Functional-Component-Cheat-Sheet-Feature.png",590,410,false]},"author_info":{"info":["Morne de Heer, CEO &amp; Founder of Brand Nexus Studios"]},"category_info":"<a href=\"https:\/\/brandnexusstudios.co.za\/blog\/category\/business\/\" rel=\"category tag\">Business<\/a> <a href=\"https:\/\/brandnexusstudios.co.za\/blog\/category\/digital-marketing\/\" rel=\"category tag\">Digital Marketing<\/a>","tag_info":"Digital Marketing","comment_count":"0","_links":{"self":[{"href":"https:\/\/brandnexusstudios.co.za\/blog\/wp-json\/wp\/v2\/posts\/2603","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/brandnexusstudios.co.za\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/brandnexusstudios.co.za\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/brandnexusstudios.co.za\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/brandnexusstudios.co.za\/blog\/wp-json\/wp\/v2\/comments?post=2603"}],"version-history":[{"count":1,"href":"https:\/\/brandnexusstudios.co.za\/blog\/wp-json\/wp\/v2\/posts\/2603\/revisions"}],"predecessor-version":[{"id":2610,"href":"https:\/\/brandnexusstudios.co.za\/blog\/wp-json\/wp\/v2\/posts\/2603\/revisions\/2610"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/brandnexusstudios.co.za\/blog\/wp-json\/wp\/v2\/media\/2609"}],"wp:attachment":[{"href":"https:\/\/brandnexusstudios.co.za\/blog\/wp-json\/wp\/v2\/media?parent=2603"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/brandnexusstudios.co.za\/blog\/wp-json\/wp\/v2\/categories?post=2603"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/brandnexusstudios.co.za\/blog\/wp-json\/wp\/v2\/tags?post=2603"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}