// Add a method conditionally
Function.prototype.method = function (name, func) {
	if (!this.prototype[name]) {
		this.prototype[name] = func;
		return this;
	}
};

Number.method('integer', function () {
	return Math[this < 0 ? 'ceil' : 'floor'](this);							   
});

String.method('trim', function () {
	return this.replace(/^\s+|\s+$/g, '');
});