implementation.js 1.1 KB

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  1. 'use strict';
  2. var ToInteger = require('es-abstract/2018/ToInteger');
  3. var ToLength = require('es-abstract/2018/ToLength');
  4. var ToObject = require('es-abstract/2018/ToObject');
  5. var SameValueZero = require('es-abstract/2018/SameValueZero');
  6. var $isNaN = require('es-abstract/helpers/isNaN');
  7. var $isFinite = require('es-abstract/helpers/isFinite');
  8. var GetIntrinsic = require('es-abstract/GetIntrinsic');
  9. var callBind = require('es-abstract/helpers/callBind');
  10. var $indexOf = callBind.apply(GetIntrinsic('%Array.prototype.indexOf%'));
  11. module.exports = function includes(searchElement) {
  12. var fromIndex = arguments.length > 1 ? ToInteger(arguments[1]) : 0;
  13. if ($indexOf && !$isNaN(searchElement) && $isFinite(fromIndex) && typeof searchElement !== 'undefined') {
  14. return $indexOf(this, arguments) > -1;
  15. }
  16. var O = ToObject(this);
  17. var length = ToLength(O.length);
  18. if (length === 0) {
  19. return false;
  20. }
  21. var k = fromIndex >= 0 ? fromIndex : Math.max(0, length + fromIndex);
  22. while (k < length) {
  23. if (SameValueZero(searchElement, O[k])) {
  24. return true;
  25. }
  26. k += 1;
  27. }
  28. return false;
  29. };