Creating "static" members in a javascript object

Question

Is there a way to create "static" members in a JS Object?

function Person(){

}

Person.prototype.age = null;
Person.prototype.gender = null;

I would like to add personsCount as a static member, is that possible?

Yes, you can do that. (You don't really mean, "in a JavaScript object"; you mean, "in a **class** of JavaScript objects".) — Pointy, Jul 01 '13 at 13:53
Please use the search function on stackoverflow first, i think this is the answer on your question: http://stackoverflow.com/a/1535687/863641 — Bjorn, Jul 01 '13 at 13:54
@Pointy classes are just objects in JavaScript anyway. (Though I don't think "class" is the right word to use in JavaScript to begin with, but I haven't used prototypes enough to know for sure.) — JAB, Jul 01 '13 at 14:00
@JAB yes I agree; I meant "class" in the more generic, colloquial sense :) The point was that if you've only got one object, the concept of "static member" isn't really meaningful. — Pointy, Jul 01 '13 at 14:04

score 7 · Accepted Answer · answered Jul 01 '13 at 13:53

7

Sure, just add Person.personsCount without the prototype

answered Jul 01 '13 at 13:53

Shlomi Schwartz

score 4 · Answer 2 · answered Jul 01 '13 at 13:54

4

Common practise is to make such "static members" properties of the constructor function itself:

function Person() {
    Person.count++;
}
Person.count = 0;

answered Jul 01 '13 at 13:54

Bergi

2 Answers2