es.array.push.js 1.3 KB

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  1. 'use strict';
  2. var $ = require('../internals/export');
  3. var toObject = require('../internals/to-object');
  4. var lengthOfArrayLike = require('../internals/length-of-array-like');
  5. var doesNotExceedSafeInteger = require('../internals/does-not-exceed-safe-integer');
  6. var fails = require('../internals/fails');
  7. var INCORRECT_TO_LENGTH = fails(function () {
  8. return [].push.call({ length: 0x100000000 }, 1) !== 4294967297;
  9. });
  10. // V8 and Safari <= 15.4, FF < 23 throws InternalError
  11. // https://bugs.chromium.org/p/v8/issues/detail?id=12681
  12. var SILENT_ON_NON_WRITABLE_LENGTH = !function () {
  13. try {
  14. // eslint-disable-next-line es-x/no-object-defineproperty -- safe
  15. Object.defineProperty([], 'length', { writable: false }).push();
  16. } catch (error) {
  17. return error instanceof TypeError;
  18. }
  19. }();
  20. // `Array.prototype.push` method
  21. // https://tc39.es/ecma262/#sec-array.prototype.push
  22. $({ target: 'Array', proto: true, arity: 1, forced: INCORRECT_TO_LENGTH || SILENT_ON_NON_WRITABLE_LENGTH }, {
  23. // eslint-disable-next-line no-unused-vars -- required for `.length`
  24. push: function push(item) {
  25. var O = toObject(this);
  26. var len = lengthOfArrayLike(O);
  27. var argCount = arguments.length;
  28. doesNotExceedSafeInteger(len + argCount);
  29. for (var i = 0; i < argCount; i++) {
  30. O[len] = arguments[i];
  31. len++;
  32. }
  33. O.length = len;
  34. return len;
  35. }
  36. });