16 lines
350 B
JavaScript
16 lines
350 B
JavaScript
"use strict";
|
|
|
|
var log = Math.log, sqrt = Math.sqrt;
|
|
|
|
module.exports = function (value) {
|
|
if (isNaN(value)) return NaN;
|
|
value = Number(value);
|
|
if (value === 0) return value;
|
|
if (!isFinite(value)) return value;
|
|
if (value < 0) {
|
|
value = -value;
|
|
return -log(value + sqrt(value * value + 1));
|
|
}
|
|
return log(value + sqrt(value * value + 1));
|
|
};
|