tor-browser

The Tor Browser
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optional-chain-prod-expression.js (1147B)

      1 // Copyright 2020 Salesforce.com, Inc. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 /*---
      4 esid: prod-OptionalExpression
      5 description: >
      6  Productions for ?. [Expression]
      7 info: |
      8  OptionalChain:
      9    ?.[ Expression ]
     10 features: [optional-chaining]
     11 ---*/
     12 
     13 const $ = 'x';
     14 const arr = [39, 42];
     15 
     16 arr.true = 'prop';
     17 arr[1.1] = 'other prop';
     18 
     19 const obj = {
     20  a: 'hello',
     21  undefined: 40,
     22  $: 0,
     23  NaN: 41,
     24  null: 42,
     25  x: 43,
     26  true: 44
     27 };
     28 
     29 assert.sameValue(arr?.[0], 39, '[0]');
     30 assert.sameValue(arr?.[0, 1], 42, '[0, 1]');
     31 assert.sameValue(arr?.[1], 42, '[1]');
     32 assert.sameValue(arr?.[1, 0], 39, '[1, 0]');
     33 assert.sameValue(arr?.[{}, NaN, undefined, 2, 0, 10 / 10], 42, '[{}, NaN, undefined, 2, 0, 10 / 10]');
     34 assert.sameValue(arr?.[true], 'prop', '[true]');
     35 assert.sameValue(arr?.[1.1], 'other prop', '[1.1]');
     36 
     37 assert.sameValue(obj?.[undefined], 40, '[undefined]');
     38 assert.sameValue(obj?.[NaN], 41, '[NaN]');
     39 assert.sameValue(obj?.[null], 42, '[null]');
     40 assert.sameValue(obj?.['$'], 0, '["$"]');
     41 assert.sameValue(obj?.[$], 43, '[$]');
     42 assert.sameValue(obj?.[true], 44, '[true]');
     43 
     44 reportCompare(0, 0);