ToNumber.js 929 B

12345678910111213141516171819202122232425262728293031323334
  1. 'use strict';
  2. var ToPrimitive = require('./ToPrimitive');
  3. var callBound = require('call-bound');
  4. var $replace = callBound('String.prototype.replace');
  5. var safeRegexTester = require('safe-regex-test');
  6. var isNonDecimal = safeRegexTester(/^0[ob]|^[+-]0x/);
  7. var $Number = Number;
  8. // http://262.ecma-international.org/5.1/#sec-9.3
  9. module.exports = function ToNumber(value) {
  10. var prim = ToPrimitive(value, $Number);
  11. if (typeof prim !== 'string') {
  12. return $Number(prim);
  13. }
  14. var trimmed = $replace(
  15. prim,
  16. // eslint-disable-next-line no-control-regex
  17. /^[ \t\x0b\f\xa0\ufeff\n\r\u2028\u2029\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000\u0085]+|[ \t\x0b\f\xa0\ufeff\n\r\u2028\u2029\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000\u0085]+$/g,
  18. ''
  19. );
  20. if (isNonDecimal(trimmed)) {
  21. return NaN;
  22. }
  23. return +trimmed;
  24. };