Extend native JavaScript array

Question

Is there any way to inherit a class from JS native function?

For example, I have a JS function like this:

function Xarray()
{
    Array.apply(this, a         


        

Answer 1

In your case, a good bet would be to use this pattern:

function XArray(array) {
  array = array || [];

  //add a new method
  array.second = function second() {
    return array[1];
  };

  //overwrite an existing method with a super type pattern
  var _push = array.push;
  array.push = function push() {
    _push.apply(array, arguments);
    console.log("pushed: ", arguments);
  };

  //The important line.
  return array
}

Then you can do:

var list = XArray([3, 4]);
list.second()   ; => 4

list[1] = 5;
list.second()   ; => 5

note however that:

list.constructor  ; => Array and not XArray