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Learn all about React Hooks with me! This fun and engaging series covers everything from State Management to Custom Hooks, with easy-to-understand explanations and real-life examples.
In React, memoization is the process of optimizing performance by caching the result of expensive function calls and reusing them when the inputs to the function have not changed. React provides two memoization hooks - useCallback and useMemo - which...
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Memory management is a crucial aspect of any programming language, and JavaScript is no exception. Understanding how memory is allocated and managed helps in writing efficient and optimized code. This guide covers the memory lifecycle and garbage col...
This guide covers key advanced JavaScript concepts: Iterators and Generators, Classes, and Modules (CommonJS and ECMAScript Modules). By mastering these topics, you'll be equipped to handle more complex JavaScript applications and write cleaner, more...
Asynchronous programming in JavaScript allows you to perform long-running operations without blocking the main thread, ensuring your applications remain responsive. This guide covers the key concepts and techniques for handling asynchronous operation...
The this keyword in JavaScript is a fundamental part of the language that can be a source of confusion for many developers. Understanding how this works in different contexts is crucial for writing effective and bug-free code. This comprehensive guid...
Refs are a way to store a reference to a React component or DOM element. The useRef hook is used for creating mutable references to elements or values that persist across renders.
To create a ref, we use the useRef hook in a functional component. Here's an example:
import { useRef } from 'react';
function TextInput() {
const inputRef = useRef(null);
function focusInput() {
inputRef.current.focus();
}
return (
<div>
<input type="text" ref={inputRef} />
<button onClick={focusInput}>Focus Input</button>
</div>
);
}
In this example, we create a inputRef ref by calling useRef with an initial value of null. We then use this ref to set the ref prop of an input element. We also create a focusInput function that calls the focus method on the inputRef.current element when a button is clicked.
In addition to storing references to elements, refs can also be used to store mutable values that persist across renders. Here's an example:
import { useState, useRef } from 'react';
function Counter() {
const [count, setCount] = useState(0);
const prevCountRef = useRef(0);
function handleIncrement() {
prevCountRef.current = count;
setCount(count + 1);
}
return (
<div>
<p>Current Count: {count}</p>
<p>Previous Count: {prevCountRef.current}</p>
<button onClick={handleIncrement}>Increment Count</button>
</div>
);
}
In this example, we create a prevCountRef ref to store the previous value of the count state. We use the handleIncrement function to update both the count state and the prevCountRef.current value.
The useRef hook is used for creating mutable references to elements or values that persist across renders. By calling useRef with an initial value of null or any other value, we can create a ref to a React component or DOM element. We can also use refs to store mutable values that persist across renders, allowing us to access previous state or values.
The next article in this series will cover the Memoization hooks, useMemo and useCallback. These hooks are used to optimize performance by memoizing expensive computations or preventing unnecessary re-renders in React components.