1..nが配列になるある一つの方法

> Number.prototype.n = function () { for(var i = +this, a = []; i <= n; a.push(i++)); return a; }
[Function]
> n = 15
15
> x = 1..n ()
[ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ]
> x
[ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ]
> 

問題点: ()を書かなきゃいけない.