tor-browser

The Tor Browser
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async-gen-meth-dflt-ary-ptrn-rest-ary-empty.js (1887B)

      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/dstr-binding/ary-ptrn-rest-ary-empty.case
      4 // - src/dstr-binding/default/async-gen-method-dflt.template
      5 /*---
      6 description: Rest element containing an "empty" array pattern (async generator method (default parameter))
      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    BindingRestElement : ... BindingPattern
     28 
     29    1. Let A be ArrayCreate(0).
     30    [...]
     31    3. Repeat
     32       [...]
     33       b. If iteratorRecord.[[done]] is true, then
     34          i. Return the result of performing BindingInitialization of
     35             BindingPattern with A and environment as the arguments.
     36       [...]
     37 
     38    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     39 
     40    ArrayBindingPattern : [ ]
     41 
     42    1. Return NormalCompletion(empty).
     43 
     44 ---*/
     45 var iterations = 0;
     46 var iter = function*() {
     47  iterations += 1;
     48 }();
     49 
     50 
     51 var callCount = 0;
     52 var obj = {
     53  async *method([...[]] = iter) {
     54    assert.sameValue(iterations, 1);
     55    callCount = callCount + 1;
     56  }
     57 };
     58 
     59 obj.method().next().then(() => {
     60    assert.sameValue(callCount, 1, 'invoked exactly once');
     61 }).then($DONE, $DONE);