async-gen-meth-dflt-ary-ptrn-rest-id-elision.js (1975B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-rest-id-elision.case 4 // - src/dstr-binding/default/async-gen-method-dflt.template 5 /*--- 6 description: Rest element following elision elements (async generator method (default parameter)) 7 esid: sec-asyncgenerator-definitions-propertydefinitionevaluation 8 features: [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 ArrayBindingPattern : [ Elisionopt BindingRestElement ] 27 1. If Elision is present, then 28 a. Let status be the result of performing 29 IteratorDestructuringAssignmentEvaluation of Elision with 30 iteratorRecord as the argument. 31 b. ReturnIfAbrupt(status). 32 2. Return the result of performing IteratorBindingInitialization for 33 BindingRestElement with iteratorRecord and environment as arguments. 34 ---*/ 35 var values = [1, 2, 3, 4, 5]; 36 37 38 var callCount = 0; 39 var obj = { 40 async *method([ , , ...x] = values) { 41 assert(Array.isArray(x)); 42 assert.sameValue(x.length, 3); 43 assert.sameValue(x[0], 3); 44 assert.sameValue(x[1], 4); 45 assert.sameValue(x[2], 5); 46 assert.notSameValue(x, values); 47 callCount = callCount + 1; 48 } 49 }; 50 51 obj.method().next().then(() => { 52 assert.sameValue(callCount, 1, 'invoked exactly once'); 53 }).then($DONE, $DONE);