Javascript create object structure

Question

I used to write a lot of Javascript, and now I'm just jumping back into it, but it seems like I have lost my mind. I'm trying to create an object using function, and I am doing it just the same way that my online searches suggest I should do. I created this example to show the many ways I have tried.

<script>
function a(){
    function b(){};
    this.c = function(){};
    this.d = 0;
    var e = function(){};
    var f = 0;
}
a.g = function(){};
a.prototype.h = function(){};

var a2 = function(){
    function b(){};
    this.c = function(){};
    this.d = 0;
    var e = function(){};
    var f = 0;
}
a2.g = function(){};
a2.prototype.h = function(){};
</script>

From what I remember, I should be able to call a.b(), a.c(), and a.d, and likewise for a2.

However, when I try to call them, it doesn't work. When I type the variable name in the console, it doesn't even show them as being an option. I can however call a.g(). I can't call a.h(), but I can call a.prototype.h().

I tried this in chrome, and a few things as well in both firefox and Safari.

As far as I can tell from online tutorials, this is not interacting the way I should be expecting it to.

Quentin · Accepted Answer · 2016-01-20 22:18:19Z

2

b, e and f are variables in the scope of the function a. They are never exposed outside that function.

c and d are assigned, when a is called, to whatever this is. If you call new a() then it will be the instance of a that is returned.

g is a property of a directly, so you can call it.

h is on the prototype chain so it will appear, like c and d, on instances of a created with new.

answered Jan 20, 2016 at 22:18

Quentin

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1 Comment

Tyler Cox Over a year ago

Ok, thanks. I guess I was missing the 'new' keyword. Makes sense now.

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