Util JavaScript functions

util.js

(function() {
	
	var chars = "abcdefghijklmnopqrstuvxzwyABCDEFGHIJKLMNOPQRSTUVXZWY0123456789~`!@#$%^&*()-_=+{[}]|\\;:'\"<,>.?/";
	
	/**
	 * Get a random char according to the optionsl options given.
	 * @param options can be one of:
	 * <ul>
	 *   <li><b>'alpha'</b>: only returns alphabetic chars</li>
	 *   <li><b>'lowercase'</b>: only returns alphabetic chars</li>
	 *   <li><b>'uppercase'</b>: only returns alphabetic chars</li>
	 *   <li><b>'any'</b>: returns alpha-numeric chars and some symbols</li>
	 * </ul>
	 * @returns char
	 */
	function randomChar(options) {
		switch(options) {
		case 'alpha':        return chars.slice(0, 52)[randomInt(chars.length)];
		case 'lowercase':    return chars.slice(0, 26)[randomInt(chars.length)];
		case 'uppercase':    return chars.slice(27, 52)[randomInt(chars.length)];
		case 'any': default: return chars[randomInt(chars.length)];
		}
	}
	
	/**
	 * @param n default is 100.
	 * @returns int between 0 and n.
	 */
	function randomInt(n) {
		return Math.floor(Math.random() * (n || 100));
	}

	/**
	 * @param obj to check
	 * @returns number of fields in the object
	 */
	function fieldCount(obj) {
		var count = 0;
		for (var a in obj) {
			count += 1;
		}
		return count;
	}
	
	// expose Util to the global scope.
	Util = {
		
		chars: chars,
		randomInt: randomInt,
		randomChar: randomChar,
		fieldCount: fieldCount

	};
	
})();