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?

• Olivier De Meulder: Your first element would be enemies[0]
• Sebastian Simon: Your "array" is invalid syntax.
• Abhitalks: var enemies = [{x:0, y:0}, {x:5, y:5}, {x:10, y:10}]; then just refer to enemies[index].x
• Yoshi: @Xufox It's not invalid, he's just creating a global (position).
• display name: possible duplicate of Access / process (nested) objects, arrays or JSON

Answer 1

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

• Andy: Thanks, @nikhil. Completely missed that.

Answer 2

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} ]