obj-ptrn-id-init-skipped.js (1433B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/obj-ptrn-id-init-skipped.case 4 // - src/dstr-binding/default/async-gen-func-expr.template 5 /*--- 6 description: Destructuring initializer is not evaluated when value is not `undefined` (async generator function expression) 7 esid: sec-asyncgenerator-definitions-evaluation 8 features: [async-iteration] 9 flags: [generated, async] 10 info: | 11 AsyncGeneratorExpression : async [no LineTerminator here] function * ( FormalParameters ) { 12 AsyncGeneratorBody } 13 14 [...] 15 3. Let closure be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, 16 AsyncGeneratorBody, scope, strict). 17 [...] 18 19 20 13.3.3.7 Runtime Semantics: KeyedBindingInitialization 21 22 SingleNameBinding : BindingIdentifier Initializeropt 23 24 [...] 25 6. If Initializer is present and v is undefined, then 26 [...] 27 [...] 28 ---*/ 29 var initCount = 0; 30 function counter() { 31 initCount += 1; 32 } 33 34 35 var callCount = 0; 36 var f; 37 f = async function*({ w = counter(), x = counter(), y = counter(), z = counter() }) { 38 assert.sameValue(w, null); 39 assert.sameValue(x, 0); 40 assert.sameValue(y, false); 41 assert.sameValue(z, ''); 42 assert.sameValue(initCount, 0); 43 callCount = callCount + 1; 44 }; 45 46 f({ w: null, x: 0, y: false, z: '' }).next().then(() => { 47 assert.sameValue(callCount, 1, 'invoked exactly once'); 48 }).then($DONE, $DONE);