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.js

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
  }
}