tor-browser

The Tor Browser
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async-gen-meth-ary-ptrn-elision.js (2024B)

      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/dstr-binding/ary-ptrn-elision.case
      4 // - src/dstr-binding/default/async-gen-meth.template
      5 /*---
      6 description: Elision advances iterator (async generator method)
      7 esid: sec-asyncgenerator-definitions-propertydefinitionevaluation
      8 features: [generators, async-iteration]
      9 flags: [generated, async]
     10 info: |
     11    AsyncGeneratorMethod :
     12        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
     13            { AsyncGeneratorBody }
     14 
     15    1. Let propKey be the result of evaluating PropertyName.
     16    2. ReturnIfAbrupt(propKey).
     17    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
     18       Otherwise let strict be false.
     19    4. Let scope be the running execution context's LexicalEnvironment.
     20    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
     21       AsyncGeneratorBody, scope, strict).
     22    [...]
     23 
     24 
     25    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     26 
     27    ArrayBindingPattern : [ Elision ]
     28 
     29    1. Return the result of performing
     30       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
     31       as the argument.
     32 
     33    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
     34 
     35    Elision : ,
     36 
     37    1. If iteratorRecord.[[done]] is false, then
     38       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     39       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     40       c. ReturnIfAbrupt(next).
     41       d. If next is false, set iteratorRecord.[[done]] to true.
     42    2. Return NormalCompletion(empty).
     43 
     44 ---*/
     45 var first = 0;
     46 var second = 0;
     47 function* g() {
     48  first += 1;
     49  yield;
     50  second += 1;
     51 };
     52 
     53 
     54 var callCount = 0;
     55 var obj = {
     56  async *method([,]) {
     57    assert.sameValue(first, 1);
     58    assert.sameValue(second, 0);
     59    callCount = callCount + 1;
     60  }
     61 };
     62 
     63 obj.method(g()).next().then(() => {
     64    assert.sameValue(callCount, 1, 'invoked exactly once');
     65 }).then($DONE, $DONE);