es.string.from-code-point.js 999 B

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  1. var $ = require('../internals/export');
  2. var toAbsoluteIndex = require('../internals/to-absolute-index');
  3. var fromCharCode = String.fromCharCode;
  4. var nativeFromCodePoint = String.fromCodePoint;
  5. // length should be 1, old FF problem
  6. var INCORRECT_LENGTH = !!nativeFromCodePoint && nativeFromCodePoint.length != 1;
  7. // `String.fromCodePoint` method
  8. // https://tc39.github.io/ecma262/#sec-string.fromcodepoint
  9. $({ target: 'String', stat: true, forced: INCORRECT_LENGTH }, {
  10. fromCodePoint: function fromCodePoint(x) { // eslint-disable-line no-unused-vars
  11. var elements = [];
  12. var length = arguments.length;
  13. var i = 0;
  14. var code;
  15. while (length > i) {
  16. code = +arguments[i++];
  17. if (toAbsoluteIndex(code, 0x10FFFF) !== code) throw RangeError(code + ' is not a valid code point');
  18. elements.push(code < 0x10000
  19. ? fromCharCode(code)
  20. : fromCharCode(((code -= 0x10000) >> 10) + 0xD800, code % 0x400 + 0xDC00)
  21. );
  22. } return elements.join('');
  23. }
  24. });