when 0 isn't 0

[akashiraffee]

I've never noticed this before but

var ray = new Array('one', 'two', 'three');
for (i in ray) {
    if (i) alert (ray[i]+" "+i);
}

I get an alert, "one 0", whereas

var x = 0;
if (x) alert("hello")

I don't, which is what I would expect. Why is zero counted as true in the first case?

[akashiraffee]

Ah,

for (i in ray) alert(typeof(i))

...it's a string :/