18 lines
445 B
JavaScript
18 lines
445 B
JavaScript
|
// Thanks: https://github.com/monolithed/ECMAScript-6/blob/master/ES6.js
|
||
|
|
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
var log = Math.log;
|
||
|
|
|
||
|
|
module.exports = function (value) {
|
||
|
|
if (isNaN(value)) return NaN;
|
||
|
|
value = Number(value);
|
||
|
|
if (value < -1) return NaN;
|
||
|
|
if (value === -1) return -Infinity;
|
||
|
|
if (value === 0) return value;
|
||
|
|
if (value === Infinity) return Infinity;
|
||
|
|
|
||
|
|
if (value > -1.0e-8 && value < 1.0e-8) return value - (value * value) / 2;
|
||
|
|
return log(1 + value);
|
||
|
|
};
|