venning · October 17, 2015 09:10
diff --git a/standard_deviation.js b/standard_deviation.js
 // NOTE requires lodash v3.4.0+ (for _.sum) and Node 4.0+ (for arrow function)

 var _ = require('lodash');

 function σ (array) {
    var avg = _.sum(array) / array.length;
    return Math.sqrt(_.sum(_.map(array, (i) => Math.pow((i - avg), 2))) / array.length);
 };
	// NOTE requires lodash v3.4.0+ (for _.sum) and Node 4.0+ (for arrow function)

	var _ = require('lodash');

	function σ (array) {
	var avg = _.sum(array) / array.length;
	return Math.sqrt(_.sum(_.map(array, (i) => Math.pow((i - avg), 2))) / array.length);
	};