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 $indexOf = callBound('Array.prototype.indexOf', true) || callBound('String.prototype.indexOf');
  5. var $push = callBound('Array.prototype.push');
  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 isObject = require('../helpers/isObject');
  12. var defaultElementTypes = ['Undefined', 'Null', 'Boolean', 'String', 'Symbol', 'Number', 'BigInt', 'Object'];
  13. // https://262.ecma-international.org/11.0/#sec-createlistfromarraylike
  14. /** @type {(obj: object, elementTypes?: typeof defaultElementTypes) => unknown[]} */
  15. module.exports = function CreateListFromArrayLike(obj) {
  16. var elementTypes = arguments.length > 1
  17. ? arguments[1]
  18. : defaultElementTypes;
  19. if (!isObject(obj)) {
  20. throw new $TypeError('Assertion failed: `obj` must be an Object');
  21. }
  22. if (!IsArray(elementTypes)) {
  23. throw new $TypeError('Assertion failed: `elementTypes`, if provided, must be an array');
  24. }
  25. var len = LengthOfArrayLike(obj);
  26. /** @type {(typeof elementTypes)[]} */
  27. var list = [];
  28. var index = 0;
  29. while (index < len) {
  30. var indexName = ToString(index);
  31. var next = Get(obj, indexName);
  32. var nextType = Type(next);
  33. if ($indexOf(elementTypes, nextType) < 0) {
  34. throw new $TypeError('item type ' + nextType + ' is not a valid elementType');
  35. }
  36. $push(list, next);
  37. index += 1;
  38. }
  39. return list;
  40. };