Introduction to fast-deep-equal

fast-deep-equal is a highly efficient library for deep comparison of JavaScript objects. It is designed to be fast and lightweight, making it an ideal choice for performance-sensitive applications.

API Examples

Here are some of the most commonly used APIs of fast-deep-equal along with code snippets to help you get started:

Basic Comparison

  const equal = require('fast-deep-equal'); const obj1 = { foo: 'bar' }; const obj2 = { foo: 'bar' };
console.log(equal(obj1, obj2)); // true  

Comparing Arrays

  const equal = require('fast-deep-equal'); const arr1 = [1, 2, 3]; const arr2 = [1, 2, 3];
console.log(equal(arr1, arr2)); // true  

Nested Objects

  const equal = require('fast-deep-equal'); const obj1 = { a: { b: { c: 'd' } } }; const obj2 = { a: { b: { c: 'd' } } };
console.log(equal(obj1, obj2)); // true  

Handling Functions

  const equal = require('fast-deep-equal'); const fn1 = function() {}; const fn2 = function() {};
console.log(equal(fn1, fn2)); // false  

Ignoring Specific Properties

  const equal = require('fast-deep-equal'); const obj1 = { a: 1, b: 2 }; const obj2 = { a: 1, b: 3 }; const options = { customType: (a, b) => (a === b) };
console.log(equal(obj1, obj2, options)); // false  

Example Application

Let’s see how to use fast-deep-equal in a realistic application scenario:

React Component Optimization

  import React, { memo } from 'react'; import equal from 'fast-deep-equal';
const MyComponent = memo((props) => {
  return (
    

      
{props.title}
      
{props.content}
    
  );
}, (prevProps, nextProps) => equal(prevProps, nextProps));
export default MyComponent;  

In the above example, we use fast-deep-equal to optimize a React component by preventing unnecessary re-renders when the component’s props have not changed.

By leveraging the efficiency of fast-deep-equal, your applications can achieve better performance and improved user experience.

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