JSTests/test262/test/language/statements/class/dstr/meth-dflt-ary-ptrn-elem-id-iter-val-array-prototype.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/ary-ptrn-elem-id-iter-val-array-prototype.case
// - src/dstr-binding/default/cls-decl-meth-dflt.template
/*---
description: Array destructuring uses overriden Array.prototype[Symbol.iterator] (class expression method (default parameter))
esid: sec-runtime-semantics-bindingclassdeclarationevaluation
features: [Symbol.iterator, generators, destructuring-binding, default-parameters]
flags: [generated]
info: |
    ClassDeclaration : class BindingIdentifier ClassTail

    1. Let className be StringValue of BindingIdentifier.
    2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
       argument className.
    [...]

    14.5.14 Runtime Semantics: ClassDefinitionEvaluation

    21. For each ClassElement m in order from methods
        a. If IsStatic of m is false, then
           i. Let status be the result of performing
              PropertyDefinitionEvaluation for m with arguments proto and
              false.
        [...]

    14.3.8 Runtime Semantics: DefineMethod

    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.
    [...]

    Runtime Semantics: IteratorBindingInitialization

    SingleNameBinding : BindingIdentifier Initializer_opt

    1. Let bindingId be StringValue of BindingIdentifier.
    2. Let lhs be ? ResolveBinding(bindingId, environment).
    3. If iteratorRecord.[[Done]] is false, then
        a. Let next be IteratorStep(iteratorRecord).
        b. If next is an abrupt completion, set iteratorRecord.[[Done]] to true.
        c. ReturnIfAbrupt(next).
        d. If next is false, set iteratorRecord.[[Done]] to true.
        e. Else,
            i. Let v be IteratorValue(next).
            ii. If v is an abrupt completion, set iteratorRecord.[[Done]] to true.
            iii. ReturnIfAbrupt(v).
    [...]
    7. Return InitializeReferencedBinding(lhs, v).

---*/
Array.prototype[Symbol.iterator] = function* () {
    if (this.length > 0) {
        yield this[0];
    }
    if (this.length > 1) {
        yield this[1];
    }
    if (this.length > 2) {
        yield 42;
    }
};

var callCount = 0;
class C {
  method([x, y, z] = [1, 2, 3]) {
    assert.sameValue(x, 1);
    assert.sameValue(y, 2);
    assert.sameValue(z, 42);
    callCount = callCount + 1;
  }
};

new C().method();
assert.sameValue(callCount, 1, 'method invoked exactly once');