Subclassing Javascript Arrays. TypeError: Array.prototype.toString is not generic

Question

Is it possible to subclass and inherit from javascript Arrays?

I\'d like to have my own custom Array object that has all the features of an Array, but contains addit

Answer 1

I've created a simple NPM module that solves this - inherit-array. It basically does the following:

function toArraySubClassFactory(ArraySubClass) {
  ArraySubClass.prototype = Object.assign(Object.create(Array.prototype),
                                          ArraySubClass.prototype);

  return function () {
    var arr = [ ];
    arr.__proto__ = ArraySubClass.prototype; 

    ArraySubClass.apply(arr, arguments);

    return arr;
  };
};

After writing your own SubArray class you can make it inherit Array as follows:

var SubArrayFactory = toArraySubClassFactory(SubArray);

var mySubArrayInstance = SubArrayFactory(/*whatever SubArray constructor takes*/)