Remove entry from array using another array

Question

Not sure how do to this, so any help is greatly appreciated

Say I have :

const array1 = [1, 1, 2, 3, 4];
const array2 = [1, 2];

Desired

Answer 1

Not sure the most efficiency way to do this in modern JS, and I'm pretty old-school, so here's an old-school solution:

 var array1 = [1, 1, 2, 3, 4];
    var array2 = [1, 2];
    
    // Note this method is destructive
    Array.prototype.removeFirstValueMatch = function(ar)
    {
    	var indexesToRemoveAr = [];
    	var indexesToRemoveOb = {};
    	for(var i=0, j; i