aaac7fed
 liuqimichale
add
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// Parts of implementation taken from es6-shim project
// See: https://github.com/paulmillr/es6-shim/blob/master/es6-shim.js
"use strict";
var expm1 = require("../expm1")
, abs = Math.abs
, exp = Math.exp
, e = Math.E;
module.exports = function (value) {
if (isNaN(value)) return NaN;
value = Number(value);
if (value === 0) return value;
if (!isFinite(value)) return value;
if (abs(value) < 1) return (expm1(value) - expm1(-value)) / 2;
return (exp(value - 1) - exp(-value - 1)) * e / 2;
};
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