How to Compare and Get Difference between two Arrays in JavaScript
There are a few ways to compare and get the difference between two arrays in JavaScript. Here are a few methods:
Using the indexOf() method:
The indexOf() method returns the index of the first occurrence of a value in an array. We can use this method to compare two arrays by checking if each element in one array exists in the other array. If all elements exist, then the arrays are equal. Otherwise, they are not equal.
const array1 = [1, 2, 3];
const array2 = [1, 2, 3];
const areArraysEqual = array1.every((element) = array2.indexOf(element) !== -1);
console.log(areArraysEqual); // true
Using the filter() method:
The filter() method returns a new array containing all elements of the original array that pass a test. We can use this method to compare two arrays by filtering out any elements that are not present in both arrays. The resulting array will contain the elements that are different between the two arrays.
const array1 = [1, 2, 3];
const array2 = [1, 2, 4];
const difference = array1.filter((element) = array2.indexOf(element) === -1);
console.log(difference); // [4]
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