ArrayFlatten.js

/**
 * Recursivly flatten a deeply nested array
 * @arr Array Array with nested values
 * @return Array Flattend array
 */
function flatten(arr) {
	return arr.reduce(function(result, current) {
		if (current instanceof Array) {
			return result.concat(flatten(current));
		} else {
			result.push(current);
			return result;
		}
	}, []);
}