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// Parts of implementation taken from es6-shim project | |
// See: https://github.com/paulmillr/es6-shim/blob/master/es6-shim.js | |
; | |
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; | |
}; | |