Question

How to implement array.any() and array.all() methods in Coffeescript?

Answer 1

Those are actually part of Javascript 1.6 and will work just the same in CoffeeScript. You want some and every.

I don’t know what environment you’re in, but IE < 9 doesn’t seem to support those methods. They’re pretty easy to add. There’s a snippet of code on those pages that show you compatibility code and if you want you can translate them to CoffeeScript, though you don’t have to.

A cruder, simpler way would be (untested):

if not Array.prototype.some
    Array.prototype.some = (f) -> (x for x in @ when f(x)).length > 0

if not Array.prototype.every
    Array.prototype.every = (f) -> (x for x in @ when f(x)).length == @length

But neither of those have short circuit logic. Edit: But see Ricardo’s answer for a better version of them.