Question

I have this:

var Coords = function(x, y){
        this.x = x;
        this.y = y;
    }

Coords.prototype.toArray = function(){
    return [this.x, this.y];
}

Now I have an array of Coords object. I’d like to convert each Coords instance into an array with the toArray method.
I could write a loop, but I’d rather use $.map, as it’s shorter and more readable.
Unfortunately, this:

return $.map(coords_array, Coords.prototype.toArray);

doesn’t work at all. It just stops the execution.
The problem might be about how to refer to a method independently of any object.
Any way of pointing to a method without creating an instance first?
Or to use $.map with a method?

Thanks for your insights.

EDIT: well, in fact, it doesn’t stop the execution (this came from another problem) but $.map(coords_array, Coords.prototype.toArray); returns [null, null, null, null, null…].
I find this behavior strange.

Answer 1

Try something like:

return $.map(coords_array, function(val, i) { val.toArray(); });

And refer here for more reference on jQuery’s map function.