// Thanks: https://github.com/monolithed/ECMAScript-6
  
  'use strict';
  
  var exp = Math.exp;
  
  module.exports = function (x) {
  	if (isNaN(x)) return NaN;
  	x = Number(x);
  	if (x === 0) return x;
  	if (x === Infinity) return Infinity;
  	if (x === -Infinity) return -1;
  
  	if ((x > -1.0e-6) && (x < 1.0e-6)) return x + x * x / 2;
  	return exp(x) - 1;
  };