mathball/lib/armstrong/index.js

A JavaScript library for Competitive Programming

'use strict';

/* Armstrong Number
 * Function: isArmstrong()
 */

var validate = require('../validation/positive-integer');

exports.check = function (num) {
	validate(num, 'isArmstrong');
	var str = num.toString();
	return num == str.split('').reduce(function (prev, next) {
		return prev + Math.pow(parseInt(next, 10), str.length);
	}, 0);
};