JSTests/test262/test/language/expressions/object/dstr/meth-dflt-ary-ptrn-rest-id.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/ary-ptrn-rest-id.case
// - src/dstr-binding/default/meth-dflt.template
/*---
description: Lone rest element (method (default parameter))
esid: sec-runtime-semantics-definemethod
es6id: 14.3.8
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
    BindingRestElement : ... BindingIdentifier
    [...] 3. Let A be ArrayCreate(0). [...] 5. Repeat
       [...]
       f. Let status be CreateDataProperty(A, ToString (n), nextValue).
       [...]
---*/
var values = [1, 2, 3];

var callCount = 0;
var obj = {
  method([...x] = values) {
    assert(Array.isArray(x));
    assert.sameValue(x.length, 3);
    assert.sameValue(x[0], 1);
    assert.sameValue(x[1], 2);
    assert.sameValue(x[2], 3);
    assert.notSameValue(x, values);
    callCount = callCount + 1;
  }
};

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