var math = require('mathjs');

// An array to test
var test = [100,11234,556,.445,.556];

/**
 * returns the geometric mean of an array
 * @param  {array} datas an array on n length
 * @return {float}       the geometric mean of that array
 */
var geometricMean = function(datas) {

	var newDatas = datas.reduce(function(a, b){
	return a*b;
});

	return math.pow(newDatas, 1/datas.length)

};

/**
 * [harmonicMean description]
 * @param  {array} dataSet an array of N length of numbers
 * @return {float}         the harmonic mean of that array
 */
var harmonicMean = function(dataSet) {

	var numerator = dataSet.length;

	var denominator = test.map(function(num){
		return 1/num;
	}).reduce(function(a, b){
		return a+b;
	});

	return numerator/denominator;
}



console.log(harmonicMean(test));
//1.2322434522705703
console.log(geometricMean(test));
//43.43189740303425