tor-browser

The Tor Browser
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emulates-undefined-or.js (882B)

      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 esid: sec-assignment-operators-runtime-semantics-evaluation
      5 description: >
      6  ToBoolean returns `false` for [[IsHTMLDDA]] object; rval is evaluated.
      7 info: |
      8  AssignmentExpression : LeftHandSideExpression ||= AssignmentExpression
      9 
     10  1. Let lref be the result of evaluating LeftHandSideExpression.
     11  2. Let lval be ? GetValue(lref).
     12  3. Let lbool be ! ToBoolean(lval).
     13  [...]
     14  7. Perform ? PutValue(lref, rval).
     15  8. Return rval.
     16 
     17  The [[IsHTMLDDA]] Internal Slot / Changes to ToBoolean
     18 
     19  1. If argument has an [[IsHTMLDDA]] internal slot, return false.
     20  2. Return true.
     21 features: [IsHTMLDDA, logical-assignment-operators]
     22 ---*/
     23 
     24 var value = $262.IsHTMLDDA;
     25 assert.sameValue(value ||= 2, 2);
     26 assert.sameValue(value, 2);
     27 
     28 reportCompare(0, 0);