JSFiddle - React, Tailwind, and code Playground

JavaScript

var arr1 = [1, 'a', 2, 'b', 3];
var arr2 = [1, 2, 3];


var isSuperset = arr2.every(function (val) { return arr1.indexOf(val) >= 0; });
alert("Should be true -> " + isSuperset);

arr1 = ['a', 2, 'b', 3];
arr2 = [1, 2, 3];

isSuperset = arr2.every(function (val) { return arr1.indexOf(val) >= 0; });
alert("Should be false -> " + isSuperset);