es.array.with.js 1.3 KB

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  1. 'use strict';
  2. var $ = require('../internals/export');
  3. var lengthOfArrayLike = require('../internals/length-of-array-like');
  4. var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
  5. var toIndexedObject = require('../internals/to-indexed-object');
  6. var createProperty = require('../internals/create-property');
  7. var $Array = Array;
  8. var $RangeError = RangeError;
  9. // Firefox bug
  10. var INCORRECT_EXCEPTION_ON_COERCION_FAIL = (function () {
  11. try {
  12. // eslint-disable-next-line es/no-array-prototype-with, no-throw-literal -- needed for testing
  13. []['with']({ valueOf: function () { throw 4; } }, null);
  14. } catch (error) {
  15. return error !== 4;
  16. }
  17. })();
  18. // `Array.prototype.with` method
  19. // https://tc39.es/ecma262/#sec-array.prototype.with
  20. $({ target: 'Array', proto: true, forced: INCORRECT_EXCEPTION_ON_COERCION_FAIL }, {
  21. 'with': function (index, value) {
  22. var O = toIndexedObject(this);
  23. var len = lengthOfArrayLike(O);
  24. var relativeIndex = toIntegerOrInfinity(index);
  25. var actualIndex = relativeIndex < 0 ? len + relativeIndex : relativeIndex;
  26. if (actualIndex >= len || actualIndex < 0) throw new $RangeError('Incorrect index');
  27. var A = new $Array(len);
  28. var k = 0;
  29. for (; k < len; k++) createProperty(A, k, k === actualIndex ? value : O[k]);
  30. return A;
  31. }
  32. });