JavaScript: Decimal To Fraction

decimalToFraction.js

// Adapted from: http://bateru.com/news/2011/11/improved-code-for-javascript-decimal-to-fraction/

function gcd(a, b) {
	return (b) ? gcd(b, a % b) : a;
}

var decimalToFraction = function (_decimal) {
	var top		= _decimal.toString().replace(/\d+[.]/, '');
	var bottom	= Math.pow(10, top.length);
	if (_decimal > 1) {
		top	= +top + Math.floor(_decimal) * bottom;
	}
	var x = gcd(top, bottom);
	return {
		top		: (top / x),
		bottom	: (bottom / x),
		display	: (top / x) + ':' + (bottom / x)
	};
};