How to check whether multiple values exist within an Javascript array

Question

So, I\'m using Jquery and have two arrays both with multiple values and I want to check whether all the values in the first array exist in the second.

Answer 1

You could take a Set and check all items agains it.

const
    containsAll = (needles, haystack) =>
        needles.every(Set.prototype.has, new Set(haystack));

console.log(containsAll([105, 112, 103], [106, 105, 103, 112]));