CreateListFromArrayLike.js 1.5 KB

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  1. 'use strict';
  2. var callBound = require('call-bound');
  3. var $TypeError = require('es-errors/type');
  4. var isObject = require('es-object-atoms/isObject');
  5. var $indexOf = callBound('Array.prototype.indexOf', true) || callBound('String.prototype.indexOf');
  6. var Get = require('./Get');
  7. var IsArray = require('./IsArray');
  8. var LengthOfArrayLike = require('./LengthOfArrayLike');
  9. var ToString = require('./ToString');
  10. var Type = require('./Type');
  11. var defaultElementTypes = ['Undefined', 'Null', 'Boolean', 'String', 'Symbol', 'Number', 'BigInt', 'Object'];
  12. // https://262.ecma-international.org/11.0/#sec-createlistfromarraylike
  13. /** @type {(obj: object, elementTypes?: typeof defaultElementTypes) => unknown[]} */
  14. module.exports = function CreateListFromArrayLike(obj) {
  15. var elementTypes = arguments.length > 1
  16. ? arguments[1]
  17. : defaultElementTypes;
  18. if (!isObject(obj)) {
  19. throw new $TypeError('Assertion failed: `obj` must be an Object');
  20. }
  21. if (!IsArray(elementTypes)) {
  22. throw new $TypeError('Assertion failed: `elementTypes`, if provided, must be an array');
  23. }
  24. var len = LengthOfArrayLike(obj);
  25. /** @type {(typeof elementTypes)[]} */
  26. var list = [];
  27. var index = 0;
  28. while (index < len) {
  29. var indexName = ToString(index);
  30. var next = Get(obj, indexName);
  31. var nextType = Type(next);
  32. if ($indexOf(elementTypes, nextType) < 0) {
  33. throw new $TypeError('item type ' + nextType + ' is not a valid elementType');
  34. }
  35. list[list.length] = next;
  36. index += 1;
  37. }
  38. return list;
  39. };