js

A collection of JavaScript extensions that I've found useful in the past. Does depend on MooTools, but each one is simple enough to turn back into vanilla JS.

Function

Function.not

function isOdd(num) {
	return num % 2;
}

isEven = Function.not(isOdd);

isTrue = true
isFalse = Function.not(isTrue); // function that returns !isTrue

Function.kwargs

Blog post.

var example = function(alpha, bravo, charlie) {
	console.log(alpha + ' ' + bravo + ' ' + charlie);
}.kwargs();

example();
example('hello', 'world', '!');
example({alpha: 'goodbye', charlie: 'world', bravo: 'cruel'});
example('sup', { charlie: 'dog' });

Function.curry

function sum(a, b) {
	return a + b;
}

var twoPlus = sum.curry(2);

twoPlus(3); // 2 + 3

Function.lazy

var digit_name = function(n) {
	var names = ['zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine'];
	return function(n) {
		return names[n];
	};
}.lazy();

digit_name(3); //init, then return
digit_name(2); //return

Array

Array.batch

Similar to Array.each, but loops in batches, use setTimeout to allow the Browser thread to do other things, like respond to UI events and changes. Useful for really big arrays, or really intensive functions.

Array.range

Like range in Python.

Array.range(3, 6); // [3, 4, 5]