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An array method to check if one array is equal to another. NOTE: this is only built for simple arrays with singular values, e.g: ['a','b','c'], not complex arrays, e.g: ['a', {this:'that',up:'down'}]
Array.prototype.isEqualTo = function(arr2){ // defining the Array method
var arr1 = this; // accesing the first array
if (arr1.length==arr2.length){ // if they have the same length
arr1 = arr1.filter(item=>{ // filter through arr1
if (arr2.indexOf(item) > -1){ // if item from arr1 is in arr2
return false; // remove from arr1 so we know its been accounted for
return true; // keep in arr1 as not in arr2
if (arr1.length == 0) return true; // no items left so must be equal
return false; // NOT EQUAL
}else{ // different lengths so can't be equal
return false; // NOT EQUAL
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