Math extensions

Math.js

// http://www.ideashower.com/our_solutions/leastgreatest-common-mulitple-lcmgcm-in-php-and-javascript/

/* Greatest Common Divisor */
Math.gcd = function(a, b) {
	return ( b == 0 ) ? (a):( Math.gcd(b, a % b) );
};

/* Lowest Common Divisor */
Math.lcd = function(a, b) {
	return ( a / Math.gcd(a,b) ) * b;
};

/* given an array find the lowest common divisor */
Math.lcds = function (ar) {
	if (ar.length > 1) {
		ar.push( Math.lcd( ar.shift() , ar.shift() ) );
		return Math.lcds( ar );
	} else {
		return ar[0];
	}
};