git.r.bdr.sh - rbdr/dotfiles/blob

   1 // Credit: https://github.com/paulmillr/es6-shim/blob/master/es6-shim.js
   2
   3 'use strict';
   4
   5 var toFloat32;
   6
   7 if (typeof Float32Array !== 'undefined') {
   8         toFloat32 = (function () {
   9                 var float32Array = new Float32Array(1);
  10                 return function (x) {
  11                         float32Array[0] = x;
  12                         return float32Array[0];
  13                 };
  14         }());
  15 } else {
  16         toFloat32 = (function () {
  17                 var pack   = require('../_pack-ieee754')
  18                   , unpack = require('../_unpack-ieee754');
  19
  20                 return function (x) {
  21                         return unpack(pack(x, 8, 23), 8, 23);
  22                 };
  23         }());
  24 }
  25
  26 module.exports = function (x) {
  27         if (isNaN(x)) return NaN;
  28         x = Number(x);
  29         if (x === 0) return x;
  30         if (!isFinite(x)) return x;
  31
  32         return toFloat32(x);
  33 };