Handy JavaScript Functions

handy.js

/**
 * JavaScript's typeof method returns "object" for arrays and null values. This fixes that.
 * http://javascript.crockford.com/remedial.html
 */
function typeOf(value) {
    var s = typeof value;
    if (s === 'object') {
        if (value) {
            if (value instanceof Array) {
                s = 'array';
            }
        } else {
            s = 'null';
        }
    }
    return s;
}

/**
 * Evaluates any JavaScript object that is a Number to see if it is a
 * multiple of the number passed
 * @example
 * // returns true
 * 15.isMultipleOf(5);
 * @method
 * @param {Number}
 * @returns {Boolean}
 */
Number.prototype.isMultipleOf = function(n) {
    return (this % n) === 0;
};