tor-browser

The Tor Browser
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left-hand-side-private-reference-data-property-short-circuit-and.js (1974B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/logical-assignment-private/and.case
      3 // - src/logical-assignment-private/default/data-property-short-circuit.template
      4 /*---
      5 description: Logical-and assignment with target being a private reference (to a field (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      3. If _entry_.[[Kind]] is ~field~, then
     26        a. Set _entry_.[[Value]] to _value_.
     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. Let _lbool_ be ! ToBoolean(_lval_).
     34      4. If _lbool_ is *false*, return _lval_.
     35      ...
     36      7. Perform ? PutValue(_lref_, _rval_).
     37      8. Return _rval_.
     38 ---*/
     39 
     40 
     41 function doNotCall() {
     42  throw new Test262Error("The right-hand side should not be evaluated");
     43 }
     44 
     45 class C {
     46  #field = false;
     47  compoundAssignment() {
     48    return this.#field &&= doNotCall();
     49  }
     50  fieldValue() {
     51    return this.#field;
     52  }
     53 }
     54 
     55 const o = new C();
     56 assert.sameValue(o.compoundAssignment(), false, "The expression should evaluate to the short-circuit value");
     57 
     58 reportCompare(0, 0);