| // Thanks for hints: https://github.com/paulmillr/es6-shim |
| |
| 'use strict'; |
| |
| var some = Array.prototype.some, abs = Math.abs, sqrt = Math.sqrt |
| |
| , compare = function (a, b) { return b - a; } |
| , divide = function (x) { return x / this; } |
| , add = function (sum, number) { return sum + number * number; }; |
| |
| module.exports = function (val1, val2/*, …valn*/) { |
| var result, numbers; |
| if (!arguments.length) return 0; |
| some.call(arguments, function (val) { |
| if (isNaN(val)) { |
| result = NaN; |
| return; |
| } |
| if (!isFinite(val)) { |
| result = Infinity; |
| return true; |
| } |
| if (result !== undefined) return; |
| val = Number(val); |
| if (val === 0) return; |
| if (!numbers) numbers = [abs(val)]; |
| else numbers.push(abs(val)); |
| }); |
| if (result !== undefined) return result; |
| if (!numbers) return 0; |
| |
| numbers.sort(compare); |
| return numbers[0] * sqrt(numbers.map(divide, numbers[0]).reduce(add, 0)); |
| }; |
