convert.js

convert = (function () {
	return {
		toString: toString,
		toNumber: toNumber,
		toArray: toArray,
	}

	function toString(value) {
		if (typeof value === 'undefined' || value === null) return '';
		return String(value);
	}

	function toNumber(value) {
		if (typeof value === 'undefined' || value === null) return 0;
		return Number(value);
	}

	function toArray(value) {
		if (typeof value === 'undefined' || value === null) return [];
		if (value instanceof Array) return value;
		if (value.length) {
			var arrayLike = true;
			for (var i = 0; i < value.length; i++) {
				if (typeof value.length[i] === 'undefined') {
					arrayLike = false;
					break;
				}
			}
			if (arrayLike) return Array.prototype.slice.call(value);
		}
		return [value];
	}
})();