| // This file was procedurally generated from the following sources: |
| // - src/dstr-binding/obj-ptrn-id-init-skipped.case |
| // - src/dstr-binding/default/gen-meth.template |
| /*--- |
| description: Destructuring initializer is not evaluated when value is not `undefined` (generator method) |
| esid: sec-generator-function-definitions-runtime-semantics-propertydefinitionevaluation |
| features: [generators, destructuring-binding] |
| flags: [generated] |
| info: | |
| GeneratorMethod : |
| * PropertyName ( StrictFormalParameters ) { GeneratorBody } |
| |
| 1. Let propKey be the result of evaluating PropertyName. |
| 2. ReturnIfAbrupt(propKey). |
| 3. If the function code for this GeneratorMethod is strict mode code, |
| let strict be true. Otherwise let strict be false. |
| 4. Let scope be the running execution context's LexicalEnvironment. |
| 5. Let closure be GeneratorFunctionCreate(Method, |
| StrictFormalParameters, GeneratorBody, scope, strict). |
| [...] |
| |
| 9.2.1 [[Call]] ( thisArgument, argumentsList) |
| |
| [...] |
| 7. Let result be OrdinaryCallEvaluateBody(F, argumentsList). |
| [...] |
| |
| 9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList ) |
| |
| 1. Let status be FunctionDeclarationInstantiation(F, argumentsList). |
| [...] |
| |
| 9.2.12 FunctionDeclarationInstantiation(func, argumentsList) |
| |
| [...] |
| 23. Let iteratorRecord be Record {[[iterator]]: |
| CreateListIterator(argumentsList), [[done]]: false}. |
| 24. If hasDuplicates is true, then |
| [...] |
| 25. Else, |
| b. Let formalStatus be IteratorBindingInitialization for formals with |
| iteratorRecord and env as arguments. |
| [...] |
| |
| 13.3.3.7 Runtime Semantics: KeyedBindingInitialization |
| |
| SingleNameBinding : BindingIdentifier Initializeropt |
| |
| [...] |
| 6. If Initializer is present and v is undefined, then |
| [...] |
| [...] |
| ---*/ |
| var initCount = 0; |
| function counter() { |
| initCount += 1; |
| } |
| |
| var callCount = 0; |
| var obj = { |
| *method({ w = counter(), x = counter(), y = counter(), z = counter() }) { |
| assert.sameValue(w, null); |
| assert.sameValue(x, 0); |
| assert.sameValue(y, false); |
| assert.sameValue(z, ''); |
| assert.sameValue(initCount, 0); |
| callCount = callCount + 1; |
| } |
| }; |
| |
| obj.method({ w: null, x: 0, y: false, z: '' }).next(); |
| assert.sameValue(callCount, 1, 'generator method invoked exactly once'); |