better asserts, that can be switched of with a DEV variable.

asserts.js

"use strict";

if (typeof DEV == 'undefined') return;

function assert(condition, message){
	if (!condition) throw new Error(message || "Assertion fault");
}

exports.assert = assert;

exports.assertFunction = function(fn, message){
	assert(typeof fn == 'function', message || 'expected a function');
};

exports.assertNumber = function(num, message){
	assert(typeof num == 'number', message || 'expected a number');
};

exports.assertNumber = function(str, message){
	assert(typeof str == 'string', message || 'expected a string');
};

exports.assertLength = function(obj, len, message){
	assert(obj && obj.length === len, message || 'expect object to have a length of ' + len);
};

exports.assertMinLength = function(obj, len, message){
	assert(obj && obj.length >= len, message || 'expect object to have a minimum length of ' + len);
};