dflt-ary-ptrn-elem-id-init-hole.js (1415B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-elem-id-init-hole.case 4 // - src/dstr-binding/default/async-gen-func-decl-dflt.template 5 /*--- 6 description: Destructuring initializer with a "hole" (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 SingleNameBinding : BindingIdentifier Initializeropt 22 [...] 6. If Initializer is present and v is undefined, then 23 a. Let defaultValue be the result of evaluating Initializer. 24 b. Let v be GetValue(defaultValue). 25 [...] 26 7. If environment is undefined, return PutValue(lhs, v). 8. Return InitializeReferencedBinding(lhs, v). 27 ---*/ 28 29 30 var callCount = 0; 31 async function* f([x = 23] = [,]) { 32 assert.sameValue(x, 23); 33 // another statement 34 callCount = callCount + 1; 35 }; 36 f().next().then(() => { 37 assert.sameValue(callCount, 1, 'invoked exactly once'); 38 }).then($DONE, $DONE);