by Sai gowtham

How to get the intersection of two arrays in JavaScript

In JavaScript, we can use the filter() method and includes() method to get the intersection of two arrays.

Here is an example, that returns the intersection of arr1 and arr2 which is [4, 6]:

const arr1 = [4,5,6,7];
const arr2 = [4,6,1,3];

const intersection = arr1.filter(val=>arr2.includes(val));

console.log(intersection); // [4,6]

Similarly, we can also find it like this.

const arr1 = [4,5,6,7];
const arr2 = [4,6,1,3];

const intersection = arr1.filter(val=>arr2.indexOf(val)<-1);

console.log(intersection); // [4,6]

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