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) { 
    var numIn1 = arr1.filter(function(el) { return el === val;  }).length;
    var numIn2 = arr2.filter(function(el) { return el === val;  }).length;
    return numIn1 === numIn2;   
});
alert("Should be true -> " + isSuperset);



arr1 = [1, 'a', 2, 'b', 3, 3];
arr2 = [1, 2, 3];
isSuperset = arr2.every(function (val) { 
    var numIn1 = arr1.filter(function(el) { return el === val;  }).length;
    var numIn2 = arr2.filter(function(el) { return el === val;  }).length;
    return numIn1 === numIn2;   
});
alert("Should be false -> " + isSuperset);


arr1 = [1, 'a', 2, 'b', 3];
arr2 = [1, 2, 3, 3];
isSuperset = arr2.every(function (val) { 
    var numIn1 = arr1.filter(function(el) { return el === val;  }).length;
    var numIn2 = arr2.filter(function(el) { return el === val;  }).length;
    return numIn1 === numIn2;   
});
alert("Should be false -> " + isSuperset);