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How to optimize React component to render it ?
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How useMemo Hook optimizes performance in React Component ?

Last Updated : 18 Mar, 2024
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The useMemo hook in React optimizes performance by memoizing the result of a function and caching it. This caching ensures that expensive computations inside the useMemo callback are only re-executed when the dependencies change, preventing unnecessary recalculations and improving the rendering performance of the component.

How useMemo Hook Optimizes Performance ?

By memoizing the result of a function computation, 'useMemo' helps prevent unnecessary re-execution of expensive computations in a React component. This optimization avoids redundant calculations during renders, improving performance, especially with complex computations and large components.

Approach to implement useMemo Hook in React Component:

  • In the below example define calculateFactorial function to compute factorial and use useMemo to memoize based on number dependency.
  • Ensure the factorial is recalculated only on number prop change, optimizing performance.
  • Add a counter button to increase count state, showing an unrelated state doesn't trigger a recalculation.
  • Demonstrate useMemo maintaining memoized value during re-renders, showcasing efficiency.
  • Highlight performance benefits in scenarios with costly computations, improving overall app performance.

Example: The below example calculates the factorial of a number.

JavaScript 
import React, { useState, useMemo } from 'react';  const FactorialCalculator = () => {     const [number, setNumber] = useState(0)     const [count, setCount] = useState(0);      const calculateFactorial = (num) => {         console.log(`Calculating factorial of ${num}`);         let result = 1;         for (let i = 2; i <= num; i++) {             result *= i;         }         return result;     };      const factorial = useMemo(         () => calculateFactorial(number), [number]);      return (         <div>             <h2>Factorial Calculator</h2>             <p>Number:{number} </p>             <p>Factorial: {factorial}</p>             <button onClick={                 () => setNumber(number + 1)}>Next factorial             </button>             <hr />             <p>Count: {count}</p>             <button onClick={                 () => setCount(count + 1)}>Increment Count             </button>          </div>     ); };  export default FactorialCalculator;

Output:

Untitled-design-26-ezgifcom-crop

Conclusion:

The 'useMemo' hook in React is a powerful tool for optimizing performance by memoizing the result of a function computation. By using `useMemo`, you can prevent unnecessary re-renders of components and improve the overall efficiency of your React applications. Incorporating `useMemo` into your components can lead to smoother user experiences and better performance, especially in scenarios where heavy computations are involved.


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Article Tags :
  • Web Technologies
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