ary-ptrn-elem-ary-elem-init.js (1527B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-elem-ary-elem-init.case 4 // - src/dstr-binding/default/async-gen-func-decl.template 5 /*--- 6 description: BindingElement with array binding pattern and initializer is used (async generator function declaration) 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 BindingElement : BindingPatternInitializer opt 23 24 [...] 25 2. If iteratorRecord.[[done]] is true, let v be undefined. 26 3. If Initializer is present and v is undefined, then 27 a. Let defaultValue be the result of evaluating Initializer. 28 b. Let v be ? GetValue(defaultValue). 29 4. Return the result of performing BindingInitialization of BindingPattern 30 with v and environment as the arguments. 31 ---*/ 32 33 34 var callCount = 0; 35 async function* f([[x, y, z] = [4, 5, 6]]) { 36 assert.sameValue(x, 4); 37 assert.sameValue(y, 5); 38 assert.sameValue(z, 6); 39 callCount = callCount + 1; 40 }; 41 f([]).next().then(() => { 42 assert.sameValue(callCount, 1, 'invoked exactly once'); 43 }).then($DONE, $DONE);