async-gen-meth-ary-ptrn-elem-ary-elision-init.js (1902B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-elem-ary-elision-init.case 4 // - src/dstr-binding/default/async-gen-meth.template 5 /*--- 6 description: BindingElement with array binding pattern and initializer is used (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 BindingElement : BindingPatternInitializer opt 28 29 [...] 30 2. If iteratorRecord.[[done]] is true, let v be undefined. 31 3. If Initializer is present and v is undefined, then 32 a. Let defaultValue be the result of evaluating Initializer. 33 b. Let v be ? GetValue(defaultValue). 34 4. Return the result of performing BindingInitialization of BindingPattern 35 with v and environment as the arguments. 36 37 ---*/ 38 var first = 0; 39 var second = 0; 40 function* g() { 41 first += 1; 42 yield; 43 second += 1; 44 }; 45 46 47 var callCount = 0; 48 var obj = { 49 async *method([[,] = g()]) { 50 assert.sameValue(first, 1); 51 assert.sameValue(second, 0); 52 callCount = callCount + 1; 53 } 54 }; 55 56 obj.method([]).next().then(() => { 57 assert.sameValue(callCount, 1, 'invoked exactly once'); 58 }).then($DONE, $DONE);