dflt-ary-ptrn-elem-id-iter-val.js (1808B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-elem-id-iter-val.case 4 // - src/dstr-binding/default/async-gen-func-decl-dflt.template 5 /*--- 6 description: SingleNameBinding when value iteration was completed previously (async generator function declaration (default parameter)) 7 esid: sec-asyncgenerator-definitions-instantiatefunctionobject 8 features: [async-iteration] 9 flags: [generated, async] 10 info: | 11 AsyncGeneratorDeclaration : async [no LineTerminator here] function * BindingIdentifier 12 ( FormalParameters ) { AsyncGeneratorBody } 13 14 [...] 15 3. Let F be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, AsyncGeneratorBody, 16 scope, strict). 17 [...] 18 19 20 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 21 22 SingleNameBinding : BindingIdentifier Initializeropt 23 24 [...] 25 4. If iteratorRecord.[[done]] is false, then 26 a. Let next be IteratorStep(iteratorRecord.[[iterator]]). 27 b. If next is an abrupt completion, set iteratorRecord.[[done]] to true. 28 c. ReturnIfAbrupt(next). 29 d. If next is false, set iteratorRecord.[[done]] to true. 30 e. Else, 31 [...] 32 i. Let v be IteratorValue(next). 33 ii. If v is an abrupt completion, set 34 iteratorRecord.[[done]] to true. 35 iii. ReturnIfAbrupt(v). 36 5. If iteratorRecord.[[done]] is true, let v be undefined. 37 [...] 38 8. Return InitializeReferencedBinding(lhs, v). 39 ---*/ 40 41 42 var callCount = 0; 43 async function* f([x, y, z] = [1, 2, 3]) { 44 assert.sameValue(x, 1); 45 assert.sameValue(y, 2); 46 assert.sameValue(z, 3); 47 callCount = callCount + 1; 48 }; 49 f().next().then(() => { 50 assert.sameValue(callCount, 1, 'invoked exactly once'); 51 }).then($DONE, $DONE);