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1. advance-timer.jsx advance-timer.jsx

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   import { useEffect, useState } from "react";

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   export default function Timer() {

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     const [secounds, setSecounds] = useState(0);

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2. useFetch.ts useFetch.ts

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   import { useState, useEffect } from "react";

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   const useFetch = (url) => {

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     const [isLoading, setIsLoading] = useState(false);

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     const [error, setError] = useState(null);

3. use-callback-example.tsx use-callback-example.tsx

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   import { useState, useCallback, memo } from "react";

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   const initialUsers = [

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     { id: 1, name: "Vladis" },

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     { id: 2, name: "Nofar" },

4. useDebounce.ts useDebounce.ts

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   import { useEffect, useMemo, useRef } from "react";

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   function debounce(fn, delay) {

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     let timeout;

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5. use-memo-example.tsx use-memo-example.tsx

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   import { useState, useMemo } from "react";

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   const users = [

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     {

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       id: "1",

6. advance-use-fetch.jsx advance-use-fetch.jsx

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   import { useState, useEffect, useRef } from "react";

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   export default function useFetch(url) {

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     const [data, setData] = useState(null);

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     const [isLoading, setIsLoading] = useState(false);