Convert boolean result into number/integer

Question

I have a variable that stores false or true, but I need 0 or 1 instead, respectively. How can I do this?

Answer 1

I created a JSperf comparison of all suggested answers.

TL;DR - the best option for all current browsers is:

val | 0;

.

Update:

It seems like these days they are all pretty identical, except that the Number() function is the slowest, while the best being val === true ? 1 : 0;.