SortIndexedProperties.js 1.6 KB

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  1. 'use strict';
  2. var callBound = require('call-bound');
  3. var $TypeError = require('es-errors/type');
  4. var isInteger = require('math-intrinsics/isInteger');
  5. var isObject = require('es-object-atoms/isObject');
  6. var DeletePropertyOrThrow = require('./DeletePropertyOrThrow');
  7. var Get = require('./Get');
  8. var HasProperty = require('./HasProperty');
  9. var Set = require('./Set');
  10. var ToString = require('./ToString');
  11. var isAbstractClosure = require('../helpers/isAbstractClosure');
  12. var $sort = callBound('Array.prototype.sort');
  13. // https://262.ecma-international.org/13.0/#sec-sortindexedproperties
  14. module.exports = function SortIndexedProperties(obj, len, SortCompare) {
  15. if (!isObject(obj)) {
  16. throw new $TypeError('Assertion failed: Type(obj) is not Object');
  17. }
  18. if (!isInteger(len) || len < 0) {
  19. throw new $TypeError('Assertion failed: `len` must be an integer >= 0');
  20. }
  21. if (!isAbstractClosure(SortCompare) || SortCompare.length !== 2) {
  22. throw new $TypeError('Assertion failed: `SortCompare` must be an abstract closure taking 2 arguments');
  23. }
  24. var items = []; // step 1
  25. var k = 0; // step 2
  26. while (k < len) { // step 3
  27. var Pk = ToString(k);
  28. var kPresent = HasProperty(obj, Pk);
  29. if (kPresent) {
  30. var kValue = Get(obj, Pk);
  31. items[items.length] = kValue;
  32. }
  33. k += 1;
  34. }
  35. var itemCount = items.length; // step 4
  36. $sort(items, SortCompare); // step 5
  37. var j = 0; // step 6
  38. while (j < itemCount) { // step 7
  39. Set(obj, ToString(j), items[j], true);
  40. j += 1;
  41. }
  42. while (j < len) { // step 8
  43. DeletePropertyOrThrow(obj, ToString(j));
  44. j += 1;
  45. }
  46. return obj; // step 9
  47. };