{"id":3649,"date":"2023-03-22T22:29:00","date_gmt":"2023-03-22T15:29:00","guid":{"rendered":"https:\/\/laoitdev.com\/?p=3649"},"modified":"2024-02-07T20:56:53","modified_gmt":"2024-02-07T13:56:53","slug":"react-hooks-usestate-useeffect-usecallback-and-usememo","status":"publish","type":"post","link":"https:\/\/laoitdev.com\/lao\/2023\/3649\/","title":{"rendered":"React Hooks\u00a0useState,\u00a0useEffect,\u00a0useCallback, and\u00a0useMemo."},"content":{"rendered":"

\u0ec3\u0e99\u0e81\u0eb2\u0e99\u0e99\u0eb3\u0ec3\u0e8a\u0ec9 React Hook \u0e97\u0eb5\u0ec8\u0ec0\u0e9b\u0eb1\u0e99 Feature \u0e82\u0ead\u0e87 React \u0ec0\u0e8a\u0eb4\u0ec8\u0e87\u0ec3\u0e99 Code Todo List \u0e99\u0eb5\u0ec9\u0e88\u0eb0\u0e9b\u0eb0\u0e81\u0ead\u0e9a\u0e94\u0ec9\u0ea7\u0e8d Hook 4 \u0ea2\u0ec8\u0eb2\u0e87\u0eab\u0ebc\u0eb1\u0e81\u0ec6\u0e97\u0eb5\u0ec8\u0e99\u0eb4\u0e8d\u0ebb\u0ea1<\/p>\n\n\n\n

\u0ec3\u0e99\u0e81\u0eb2\u0e99\u0e99\u0eb3\u0ec3\u0e8a\u0ec9 React Hook \u0e97\u0eb5\u0ec8\u0ec0\u0e9b\u0eb1\u0e99 Feature \u0e82\u0ead\u0e87 React \u0ec0\u0e8a\u0eb4\u0ec8\u0e87\u0ec3\u0e99 Code Todo List \u0e99\u0eb5\u0ec9\u0e88\u0eb0\u0e9b\u0eb0\u0e81\u0ead\u0e9a\u0e94\u0ec9\u0ea7\u0e8d Hook 4 \u0ea2\u0ec8\u0eb2\u0e87\u0eab\u0ebc\u0eb1\u0e81\u0ec6\u0e97\u0eb5\u0ec8\u0e99\u0eb4\u0e8d\u0ebb\u0ea1\u0ec3\u0e8a\u0ec9\u0e81\u0eb1\u0e99\u0ec3\u0e99\u0e9d\u0eb1\u0e87 Front End Develop \u0ea1\u0eb5\u0e94\u0eb1\u0ec8\u0e87\u0e99\u0eb5\u0ec9:<\/p>\n\n\n\n

useState<\/strong><\/p>\n\n\n\n

useState \u0e96\u0eb7\u0e81\u0e99\u0ecd\u0eb2\u0ec3\u0e8a\u0ec9\u0ec0\u0e9e\u0eb7\u0ec8\u0ead\u0eaa\u0ec9\u0eb2\u0e87\u0e95\u0ebb\u0ea7\u0ec1\u0e9b\u0e82\u0ead\u0e87\u0eaa\u0eb0\u0e96\u0eb2\u0e99\u0eb0\u0ec0\u0e9e\u0eb7\u0ec8\u0ead\u0ec0\u0e81\u0eb1\u0e9a\u0ea5\u0eb2\u0e8d\u0e81\u0eb2\u0e99\u0eaa\u0eb4\u0ec8\u0e87\u0e97\u0eb5\u0ec8\u0e95\u0ec9\u0ead\u0e87\u0ec0\u0eae\u0eb1\u0e94, \u0e84\u0ec8\u0eb2\u0e81\u0eb2\u0e99\u0e9b\u0ec9\u0ead\u0e99\u0e82\u0ecd\u0ec9\u0ea1\u0eb9\u0e99 \u0ec1\u0ea5\u0eb0 \u0ea5\u0eb2\u0e8d\u0e81\u0eb2\u0e99\u0e97\u0eb5\u0ec8\u0e96\u0eb7\u0e81\u0e81\u0eb1\u0ec8\u0e99\u0e95\u0ead\u0e87.<\/p>\n\n\n\n

useEffect<\/strong><\/p>\n\n\n\n

useEffect \u0e96\u0eb7\u0e81\u0e99\u0ecd\u0eb2\u0ec3\u0e8a\u0ec9\u0ec0\u0e9e\u0eb7\u0ec8\u0ead\u0ec0\u0ead\u0ebb\u0eb2\u0ea5\u0eb2\u0e8d\u0e81\u0eb2\u0e99 todo \u0e88\u0eb2\u0e81 API \u0e9e\u0eb2\u0e8d\u0e99\u0ead\u0e81\u0ec0\u0ea1\u0eb7\u0ec8\u0ead\u0ead\u0ebb\u0e87\u0e9b\u0eb0\u0e81\u0ead\u0e9a\u0ec0\u0e8a\u0eb7\u0ec8\u0ead\u0ea1\u0e95\u0ecd\u0ec8. \u0ea1\u0eb1\u0e99\u0e8d\u0eb1\u0e87\u0e96\u0eb7\u0e81\u0ec3\u0e8a\u0ec9\u0ec0\u0e9e\u0eb7\u0ec8\u0ead\u0ead\u0eb1\u0e9a\u0ec0\u0e94\u0e94\u0ea5\u0eb2\u0e8d\u0e81\u0eb2\u0e99 todo \u0e97\u0eb5\u0ec8\u0e96\u0eb7\u0e81\u0e81\u0eb1\u0ec8\u0e99\u0e95\u0ead\u0e87\u0e97\u0eb8\u0e81\u0e84\u0eb1\u0ec9\u0e87\u0e97\u0eb5\u0ec8\u0e84\u0ec8\u0eb2\u0e9b\u0ec9\u0ead\u0e99\u0ec0\u0e82\u0ebb\u0ec9\u0eb2\u0ea1\u0eb5\u0e81\u0eb2\u0e99\u0e9b\u0ec8\u0ebd\u0e99\u0ec1\u0e9b\u0e87.<\/p>\n\n\n\n

useCallback<\/strong><\/p>\n\n\n\n

useCallback \u0e96\u0eb7\u0e81\u0e99\u0ecd\u0eb2\u0ec3\u0e8a\u0ec9\u0ec0\u0e9e\u0eb7\u0ec8\u0ead\u0e88\u0eb7\u0ec8\u0e88\u0ecd\u0eb2\u0eab\u0e99\u0ec9\u0eb2\u0e97\u0eb5\u0ec8 handleInputChange \u0ec1\u0ea5\u0eb0 handleToggleCompleted \u0ec0\u0e9e\u0eb7\u0ec8\u0ead\u0e9a\u0ecd\u0ec8\u0ec3\u0eab\u0ec9\u0e96\u0eb7\u0e81\u0eaa\u0ec9\u0eb2\u0e87\u0ec3\u0eab\u0ea1\u0ec8\u0ec3\u0e99\u0e97\u0eb8\u0e81\u0ec6\u0e81\u0eb2\u0e99\u0eaa\u0eb0\u0ec1\u0e94\u0e87\u0e9c\u0ebb\u0e99.<\/p>\n\n\n\n

useMemo<\/strong><\/p>\n\n\n\n

useMemo \u0e96\u0eb7\u0e81\u0e99\u0ecd\u0eb2\u0ec3\u0e8a\u0ec9\u0ec0\u0e9e\u0eb7\u0ec8\u0ead\u0e88\u0eb7\u0ec8\u0e88\u0ecd\u0eb2\u0e81\u0eb2\u0e99\u0e99\u0eb1\u0e9a\u0e82\u0ead\u0e87\u0ea5\u0eb2\u0e8d\u0e81\u0eb2\u0e99 todo \u0eaa\u0ecd\u0eb2\u0ec0\u0ea5\u0eb1\u0e94\u0ec0\u0e9e\u0eb7\u0ec8\u0ead\u0e9a\u0ecd\u0ec8\u0ec3\u0eab\u0ec9\u0ea1\u0eb1\u0e99 \u0e84\u0eb4\u0e94\u0ec4\u0ea5\u0ec8\u0e84\u0eb7\u0e99\u0ec3\u0eab\u0ea1\u0ec8 \u0ec3\u0e99\u0e97\u0eb8\u0e81\u0e81\u0eb2\u0e99\u0eaa\u0eb0\u0ec0\u0ec0\u0e94\u0e87\u0e9c\u0ebb\u0e99.<\/p>\n\n\n\n

import React, { useState, useEffect, useCallback, useMemo } from \"react\";\n\ninterface Todo {\n  id: number;\n  title: string;\n  completed: boolean;\n}\nfunction todo() {\n  const [todos, setTodos] = useState<Todo[]>([]);\n  const [inputValue, setInputValue] = useState(\"\");\n  const [filteredTodos, setFilteredTodos] = useState<Todo[]>([]);\n\n  \/\/ useEffect \u0eaa\u0eb3\u0ea5\u0eb1\u0e9a\u0e81\u0eb2\u0e99\u0e94\u0eb6\u0e87\u0e82\u0ecd\u0ec9\u0ea1\u0eb9\u0e99 todos \u0e88\u0eb2\u0e81 API \u0ec0\u0ea1\u0eb7\u0ec8\u0ead\u0ec0\u0e8a\u0eb7\u0ec8\u0ead\u0ea1\u0e95\u0ecd\u0ec8(Component)\n  useEffect(() => {\n    fetch(\"<https:\/\/jsonplaceholder.typicode.com\/todos>\")\n      .then((response) => response.json())\n      .then((data) => setTodos(data));\n  }, []);\n\n  \/\/ useEffect \u0eaa\u0eb3\u0ea5\u0eb1\u0e9a\u0e81\u0eb2\u0e99\u0e81\u0eb1\u0ec8\u0e99\u0e95\u0ead\u0e87\u0ea5\u0eb2\u0e8d\u0e81\u0eb2\u0e99 todos \u0ec2\u0e94\u0e8d\u0ead\u0eb5\u0e87\u0ec3\u0eaa\u0ec8\u0e84\u0ec8\u0eb2\u0e81\u0eb2\u0e99\u0e9b\u0ec9\u0ead\u0e99\u0e82\u0ecd\u0ec9\u0ea1\u0eb9\u0e99\n  useEffect(() => {\n    setFilteredTodos(\n      todos.filter((todo) => {\n        return todo.title.toLowerCase().includes(inputValue.toLowerCase());\n      })\n    );\n  }, [inputValue, todos]);\n\n \/\/ handleInputChange => \u0ec0\u0ec0\u0e81\u0ec9\u0ec4\u0e82\u0e84\u0ec8\u0eb2\u0e81\u0eb2\u0e99\u0e9b\u0ec9\u0ead\u0e99\u0e82\u0ecd\u0ec9\u0ea1\u0eb9\u0e99\u0ec0\u0ea1\u0eb7\u0ec8\u0ead\u0e9c\u0eb9\u0ec9\u0ec3\u0e8a\u0ec9\u0e9e\u0eb4\u0ea1\u0ec3\u0e99\u0ec1\u0e96\u0e9a\u0e84\u0ebb\u0ec9\u0e99\u0eab\u0eb2\n  const handleInputChange = useCallback(\n    (event: React.ChangeEvent<HTMLInputElement>) => {\n      setInputValue(event.target.value);\n    },\n    []\n  );\n\n  \/\/handleToggleCompleted => toggle \u0edd\u0eb2\u0e8d\u0e95\u0eb4\u0e81 \u0eaa\u0eb0\u0e96\u0eb2\u0e99\u0eb0\u0e97\u0eb5\u0ec8\u0eaa\u0eb3\u0ec0\u0ea5\u0eb1\u0e94\u0ec1\u0ea5\u0ec9\u0ea7\u0e82\u0ead\u0e87\u0eaa\u0eb4\u0ec8\u0e87\u0e97\u0eb5\u0ec8\u0e95\u0ec9\u0ead\u0e87\u0ec0\u0eae\u0eb1\u0e94\n  const handleToggleCompleted = useCallback((id: number) => {\n    setTodos((prevTodos) =>\n      prevTodos.map((todo) => {\n        if (todo.id === id) {\n          return { ...todo, completed: !todo.completed };\n        }\n        return todo;\n      })\n    );\n  }, []);\n\n  \/\/ \u0e88\u0eb7\u0ec8\u0e88\u0ecd\u0eb2\u0e88\u0ecd\u0eb2\u0e99\u0ea7\u0e99\u0eaa\u0eb4\u0ec8\u0e87\u0e97\u0eb5\u0ec8\u0e95\u0ec9\u0ead\u0e87\u0ec3\u0eab\u0ec9\u0eaa\u0ecd\u0eb2\u0ec0\u0ea5\u0eb1\u0e94\n  const completedTodosCount = useMemo(() => {\n    console.log(\"=> Calculating completed todos count...\");\n    return todos.filter((todo) => todo.completed).length;\n  }, [todos]);\n \n  \/\/ \u0eaa\u0ec8\u0ea7\u0e99\u0e99\u0eb5\u0ec9\u0e88\u0eb0\u0ec0\u0e9b\u0eb1\u0e99\u0eaa\u0ec8\u0ea7\u0e99\u0e82\u0ead\u0e87 UI\n  return (\n    <div>\n      <h1>Todo List<\/h1>\n\n   {\/* 1. \u0e81\u0eb2\u0e99\u0e9b\u0ec9\u0ead\u0e99\u0e82\u0ecd\u0ec9\u0ea1\u0eb9\u0e99\u0e81\u0eb2\u0e99\u0e8a\u0ead\u0e81\u0eab\u0eb2 *\/}\n      <div>\n        <label htmlFor=\"search\">Search:<\/label>\n        <input\n          id=\"search\"\n          type=\"text\"\n          value={inputValue}\n          onChange={handleInputChange}\n        \/>\n      <\/div>\n\n   {\/* 2. \u0e88\u0ecd\u0eb2\u0e99\u0ea7\u0e99\u0ea5\u0eb2\u0e8d\u0e81\u0eb2\u0e99\u0e97\u0eb5\u0ec8\u0e95\u0ec9\u0ead\u0e87\u0ec0\u0eae\u0eb1\u0e94\u0eaa\u0ecd\u0eb2\u0ec0\u0ea5\u0eb1\u0e94 *\/}\n      <p>Completed todos: {completedTodosCount}<\/p>\n\n   {\/* 3. \u0ea5\u0eb2\u0e8d\u0e81\u0eb2\u0e99\u0e97\u0eb5\u0ec8\u0e95\u0ec9\u0ead\u0e87\u0ec0\u0eae\u0eb1\u0e94 \u0ec4\u0e94\u0ec9\u0e96\u0eb7\u0e81\u0e81\u0eb1\u0ec8\u0e99\u0e95\u0ead\u0e87\u0ec2\u0e94\u0e8d\u0ead\u0eb5\u0e87\u0ec3\u0eaa\u0ec8\u0ea1\u0eb9\u0e99\u0e84\u0ec8\u0eb2\u0e81\u0eb2\u0e99\u0e9b\u0ec9\u0ead\u0e99\u0e82\u0ecd\u0ec9\u0ea1\u0eb9\u0e99 \u0ec1\u0ea5\u0eb0 \n      \u0eaa\u0eb2\u0ea1\u0eb2\u0e94\u0eaa\u0eb0\u0eab\u0ebc\u0eb1\u0e9a\u0ea5\u0eb0\u0eab\u0ea7\u0ec8\u0eb2\u0e87\u0eaa\u0ecd\u0eb2\u0ec0\u0ea5\u0eb1\u0e94 \u0ec1\u0ea5\u0eb0 \u0e9a\u0ecd\u0ec8\u0eaa\u0ecd\u0eb2\u0ec0\u0ea5\u0eb1\u0e94\u0ec2\u0e94\u0e8d\u0e81\u0eb2\u0e99\u0e84\u0ea5\u0eb4\u0e81\u0ec3\u0eaa\u0ec8\u0e81\u0ec8\u0ead\u0e87\u0e81\u0eb2\u0ec0\u0e84\u0eb7\u0ec8\u0ead\u0e87\u0eab\u0ea1\u0eb2\u0e8d Toggle\n      *\/}\n      <div>\n        {filteredTodos.map((todo) => (\n          <li key={todo.id}>\n            <input\n              type=\"checkbox\"\n              checked={todo.completed}\n              onChange={() => handleToggleCompleted(todo.id)}\n            \/>\n            <span>{todo.title}<\/span>\n          <\/li>\n        ))}\n      <\/div>\n    <\/div>\n  );\n}\nexport default todo;<\/code><\/pre>\n\n\n\n
\u0e95\u0ebb\u0ea7\u0ea2\u0ec8\u0eb2\u0e87 Code<\/p>\n\n\n\n
https:\/\/codesandbox.io\/<\/a><\/p>\n\n\n\n
\u0e82\u0ebd\u0e99\u0ec2\u0e94\u0e8d: Souliya<\/a><\/p>\n\n\n\n
Support by: LAOITDEV<\/a><\/p>\n\n\n\n
<\/p>","protected":false},"excerpt":{"rendered":"
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