tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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source-object-length-set-elem-prop-err.js (1307B)

      1 // Copyright (C) 2020 Alexey Shvayka. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 
      4 /*---
      5 esid: sec-array.from
      6 description: >
      7  TypeError is thrown if CreateDataProperty fails.
      8  (items is not iterable)
      9 info: |
     10  Array.from ( items [ , mapfn [ , thisArg ] ] )
     11 
     12  [...]
     13  4. Let usingIterator be ? GetMethod(items, @@iterator).
     14  5. If usingIterator is not undefined, then
     15    [...]
     16  6. NOTE: items is not an Iterable so assume it is an array-like object.
     17  [...]
     18  12. Repeat, while k < len
     19    [...]
     20    e. Perform ? CreateDataPropertyOrThrow(A, Pk, mappedValue).
     21  [...]
     22 
     23  CreateDataPropertyOrThrow ( O, P, V )
     24 
     25  [...]
     26  3. Let success be ? CreateDataProperty(O, P, V).
     27  4. If success is false, throw a TypeError exception.
     28 ---*/
     29 
     30 var items = {
     31  length: 1,
     32 };
     33 
     34 var A1 = function(_length) {
     35  this.length = 0;
     36  Object.preventExtensions(this);
     37 };
     38 
     39 assert.throws(TypeError, function() {
     40  Array.from.call(A1, items);
     41 }, 'Array.from.call(A1, items) throws a TypeError exception');
     42 
     43 var A2 = function(_length) {
     44  Object.defineProperty(this, "0", {
     45    writable: true,
     46    configurable: false,
     47  });
     48 };
     49 
     50 assert.throws(TypeError, function() {
     51  Array.from.call(A2, items);
     52 }, 'Array.from.call(A2, items) throws a TypeError exception');
     53 
     54 reportCompare(0, 0);