JAVASCRIPT

how to compare elements in an array

for (let i = 0; i < a.length; i++) {
    for (let k = i + 1; k < a.length; k++) {
        if (a[i] != a[k]) {
            //do stuff
        }
    }
}

array and array compare

var array1 = [4,8,9,10];
var array2 = [4,8,9,10];