Finding an item of an array of numbers without using a loop

Question

This is a stupid question, it feels like one. But mental block is bad right now. :(

My problem is I have an array consisting only of numbers. I want to use that arra

Answer 1

A simple loop seems called for here, but-

You can do it without a loop, and without extending IE, if you convert the array to a string.

var a = [2,4,6,8,10], n = 2;

if(RegExp('\\b'+n+'\\b').test(a.join(','))){
// n is in a
}