I'd like to create a game in html5 with canvas.

But I have a performance question before

Is it better to create a variable each time I need one

```
var game = ...
var car = ...
var monster = ...

```

or is it better to instantiate only one `var` at the beginning of the script and do:

```
var game = {}
game.car = ...
game.monster = {}
game.monster.attack = function(){...}

```

Thanks for your help