[fuckingquest]

foo1 = 1
foo2 = 2
foo3 = 3

bar1 = 1
bar2 = 2
bar3 = 3

select = function(object, index){
    var out = {}
    for(var i in object){
       if(! object.hasOwnProperty(i)) return out
       if(new RegExp(String(index + "$")).test(i)) out[i] = object[i]
    }
    return out
}

console.log(select(window, 1))
console.log(select(window, 2))
console.log(select(window, 3))