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Javascript compare arrays Code Example

Last Updated on Wednesday 5th Oct 2022

compare two arrays javascript

Equality comparison

  • Comparing two arrays in JavaScript using either the loose or strict equality operators (== or ===) will most often result in false, even if the two arrays contain the same elements in the same order

javascript compare arrays

Example 1

			
					const a = [1, 2, 3];
const b = [1, 2, 3];

a === b; // false

			
	

compare arrays javascript

			
					  let names = ['Angel', 'Brian', 'Daniel'];
  let fruits = ['apples', 'bananas', 'carrots'];
  names === fruits; // false

			
	

JSON.stringify

  • Use JSON.stringify(), which allows us to serialize each array and then compare the two serialized strings.

javascript compare two arrays

			
					import {isEqual} from "lodash";

const isTwoArraysEqual = isEqual(array1, array2);

			
	
			
					const equals = (a, b) =>
  a.length === b.length &&
  a.every((v, i) => v === b[i]);

const a = [1, 2, 3];
const b = [1, 2, 3];
const str = 'a';
const strObj = new String('a');

console.log(equals(a, b)); // true
console.log(equals([str], [strObj])); // false
console.log(equals([null], [undefined])); // false

			
	

comparing arrays javascript

			
					const equals = (a, b) => JSON.stringify(a) === JSON.stringify(b);

const a = [1, 2, 3];
const b = [1, 2, 3];

equals(a, b); // true