how to compare two arrays javascript

1let difference = arrA.filter(x => !arrB.includes(x));

1function diffArray(arr1, arr2) {
2  return arr1
3    .concat(arr2)
4    .filter(item => !arr1.includes(item) || !arr2.includes(item));
5}

1const equals = (a, b) => JSON.stringify(a) === JSON.stringify(b);
2let arr1 = ['1','2'];
3let arr2 = ['1','2'];
4equals(arr1,arr2)//this return false , if not equal then its return false

1Array.prototype.equals = function(arr2) {
2  return (
3    this.length === arr2.length &&
4    this.every((value, index) => value === arr2[index])
5  );
6};
7
8[1, 2, 3].equals([1, 2, 3]);	// true
9[1, 2, 3].equals([3, 6, 4, 2]);	// false

1// To compare arrays (or any other object):
2// Simple Array Example:
3const array1 = ['potato', 'banana', 'soup']
4const array2 = ['potato', 'orange', 'soup']
5
6array1 === array2;
7// Returns false due to referential equality
8JSON.stringify(array1) === JSON.stringify(array2);
9// Returns true 
10
11
12// Another Example:
13const deepArray1 = [{test: 'dummy'}, [['woo', 'ya'], 'weird']]
14const deepArray2 = [{test: 'dummy'}, [['woo', 'ya'], 'weird']]
15
16deepArray1 === deepArray2;
17// Returns false due to referential equality
18JSON.stringify(deepArray1) === JSON.stringify(deepArray2);
19// Returns true
20
21

1function arraysAreIdentical(arr1, arr2){
2    if (arr1.length !== arr2.length) return false;
3    for (var i = 0, len = arr1.length; i < len; i++){
4        if (arr1[i] !== arr2[i]){
5            return false;
6        }
7    }
8    return true; 
9}