async-gen-meth-dflt-ary-ptrn-elision.js (2054B)
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-method-dflt.template 5 /*--- 6 description: Elision advances iterator (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 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([,] = g()) { 57 assert.sameValue(first, 1); 58 assert.sameValue(second, 0); 59 callCount = callCount + 1; 60 } 61 }; 62 63 obj.method().next().then(() => { 64 assert.sameValue(callCount, 1, 'invoked exactly once'); 65 }).then($DONE, $DONE);