js: zip with function, takes 2 lists/arrays and zips them by mapping function (f) over each pair

zipw.js

zipw = function(a,b,f) {
	var c = a.length < b.length ? {a:a, b:b} : {a:b, b:a};
	return c.a.map(function(x,i) {
		return f(x,c.b[i]);
	});
}
zipw([1,2,3],[10,11,12], function(x,y) { return x + y; }); // [11,13,15]
zipw([1,2,3],[10,11,12], function(x,y) { return x * y; }); // [10,22,36]