Looping through all instances of a javascript object

Question

if I have an object constructor like:

function cat(color, sex){
     this.color = color;
     this.sex = sex;
}

and I make some cats:

Answer 1

If you want to go through all of them storing them in array would make sense..

Something along the lines of var cats = [];

cats[0] = new cat();

cats[0].color = "red";
cats[0].name = "fluffy";

for ( var cur in cats )
{
    //Do Things
} 

Sorry for all the edits- half asleep tonight.