tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

left-hand-side-private-reference-readonly-accessor-property-short-circuit-nullish.js (1983B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/logical-assignment-private/nullish.case
      3 // - src/logical-assignment-private/default/getter-short-circuit.template
      4 /*---
      5 description: Nullish-coalescing assignment with target being a private reference (to an accessor property with getter (short-circuit version))
      6 esid: sec-assignment-operators-runtime-semantics-evaluation
      7 features: [class-fields-private, logical-assignment-operators]
      8 flags: [generated]
      9 info: |
     10    sec-property-accessors-runtime-semantics-evaluation
     11    MemberExpression : MemberExpression `.` PrivateIdentifier
     12 
     13      1. Let _baseReference_ be the result of evaluating |MemberExpression|.
     14      2. Let _baseValue_ be ? GetValue(_baseReference_).
     15      3. Let _fieldNameString_ be the StringValue of |PrivateIdentifier|.
     16      4. Return ! MakePrivateReference(_baseValue_, _fieldNameString_).
     17 
     18    PutValue (V, W)
     19      ...
     20      5.b. If IsPrivateReference(_V_) is *true*, then
     21        i. Return ? PrivateSet(_baseObj_, _V_.[[ReferencedName]], _W_).
     22 
     23    PrivateSet (O, P, value)
     24      ...
     25      5.a. Assert: _entry_.[[Kind]] is ~accessor~.
     26      b. If _entry_.[[Set]] is *undefined*, throw a *TypeError* exception.
     27 
     28 
     29    sec-assignment-operators-runtime-semantics-evaluation
     30    AssignmentExpression : LeftHandSideExpression ??= AssignmentExpression
     31      1. Let _lref_ be the result of evaluating |LeftHandSideExpression|.
     32      2. Let _lval_ be ? GetValue(_lref_).
     33      3. If _lval_ is neither *undefined* nor *null*, return _lval_.
     34      ...
     35      6. Perform ? PutValue(_lref_, _rval_).
     36      7. Return _rval_.
     37 ---*/
     38 
     39 
     40 function doNotCall() {
     41  throw new Test262Error("The right-hand side should not be evaluated");
     42 }
     43 
     44 class C {
     45  get #field() {
     46    return 1;
     47  }
     48  compoundAssignment() {
     49    return this.#field ??= doNotCall();
     50  }
     51 }
     52 
     53 const o = new C();
     54 assert.sameValue(o.compoundAssignment(), 1, "The expression should evaluate to the short-circuit value");
     55 
     56 reportCompare(0, 0);