Array within array

Question

I want to make an array within an array.

It would contain some enemies with all different positions. I tried writing it like this:

var enemies = [
    position = {
        x: 0,
        y: 0
    }
];
enemies.length = 6;

This seem to work, however, I don’t know what to write when I want to call it. enemies[1].position.x doesn’t work at all. Any leads?

var enemies = [{x:0, y:0}, {x:5, y:5}, {x:10, y:10}]; then just refer to enemies[index].x — Abhitalks
– Abhitalks, Commented Sep 15, 2015 at 12:25
@Xufox It's not invalid, he's just creating a global (position). — Yoshi
– Yoshi, Commented Sep 15, 2015 at 12:25
possible duplicate of Access / process (nested) objects, arrays or JSON — display name
– display name, Commented Sep 15, 2015 at 12:26

Andy · Accepted Answer · 2015-09-15 12:29:40Z

2

You probably want an array of enemy objects instead. Something like:

var enemies = [
    { position: { x: 0, y: 0 } },
    { position: { x: 0, y: 0 } },
    { position: { x: 0, y: 0 } }
];

var firstEnemy = enemies[0];

firstEnemy.position.x; // 0

var totalEnemies = enemies.length; // 3

edited Sep 15, 2015 at 12:29

answered Sep 15, 2015 at 12:25

Andy

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1 Comment

Andy Over a year ago

Thanks, @nikhil. Completely missed that.

a-d · Accepted Answer · 2015-09-15 12:25:40Z

1

What you want to do is

var enemies =  [
    {
        position: { x: 0, y: 0 }
    }
];

enemies[0].position.x;

Arrays index starts from 0

Also, let's deconstruct why your code doesn't throw an error, and what it exactly does.

You are declaring an array named enemies, and when declaring it you are defining a global variable named position (and its value is returned)

After execution, enemies look like this [ {x: 0, y: 0} ]

answered Sep 15, 2015 at 12:25

a-d

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