| // This file was procedurally generated from the following sources: |
| // - src/dstr-binding/ary-ptrn-elem-id-init-skipped.case |
| // - src/dstr-binding/default/meth-dflt.template |
| /*--- |
| description: Destructuring initializer is not evaluated when value is not `undefined` (method (default parameter)) |
| esid: sec-runtime-semantics-definemethod |
| features: [destructuring-binding, default-parameters] |
| flags: [generated] |
| info: | |
| MethodDefinition : PropertyName ( StrictFormalParameters ) { FunctionBody } |
| |
| [...] |
| 6. Let closure be FunctionCreate(kind, StrictFormalParameters, |
| FunctionBody, scope, strict). If functionPrototype was passed as a |
| parameter then pass its value as the functionPrototype optional argument |
| of FunctionCreate. |
| [...] |
| |
| 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. |
| [...] |
| |
| 13.3.3.6 Runtime Semantics: IteratorBindingInitialization |
| |
| SingleNameBinding : BindingIdentifier Initializeropt |
| |
| [...] |
| 6. If Initializer is present and v is undefined, then |
| [...] |
| 7. If environment is undefined, return PutValue(lhs, v). |
| 8. Return InitializeReferencedBinding(lhs, v). |
| ---*/ |
| var initCount = 0; |
| function counter() { |
| initCount += 1; |
| } |
| |
| var callCount = 0; |
| var obj = { |
| method([w = counter(), x = counter(), y = counter(), z = counter()] = [null, 0, false, '']) { |
| assert.sameValue(w, null); |
| assert.sameValue(x, 0); |
| assert.sameValue(y, false); |
| assert.sameValue(z, ''); |
| assert.sameValue(initCount, 0); |
| callCount = callCount + 1; |
| } |
| }; |
| |
| obj.method(); |
| assert.sameValue(callCount, 1, 'method invoked exactly once'); |