Can I create custom Array with custom constructor?

Question

I want to create a class that would inherit everything from Array class but has its own constructor.

The idea is something like this:

function Array2(value) 
{
    this.push(value*value);
};
Array2.prototype = new Array();
Array2(4);

Obviously this doesn't work because "this.push" doesn't work, because Array2 is not yet based on Array.

Please use composition over inheritance or else Cthulhu will be coming for you. — Aadit M Shah
– Aadit M Shah, Commented May 5, 2015 at 13:54

Omar Elawady · Accepted Answer · 2015-05-05 13:54:29Z

4

your code doesn't work because you didn't call it with new keyword which means that this is equal to window.

var a = new Array2(4);

answered May 5, 2015 at 13:54

Omar Elawady

3,3601 gold badge15 silver badges17 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

@Tom, please if this's the answer.Accept it.

It is, but I need to wait 3 more minutes :)