JSTests/test262/test/language/statements/function/dstr/dflt-obj-ptrn-prop-ary-init.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/obj-ptrn-prop-ary-init.case
// - src/dstr-binding/default/func-decl-dflt.template
/*---
description: Object binding pattern with "nested" array binding pattern using initializer (function declaration (default parameter))
esid: sec-function-definitions-runtime-semantics-instantiatefunctionobject
features: [destructuring-binding, default-parameters]
flags: [generated]
info: |
    FunctionDeclaration :
        function BindingIdentifier ( FormalParameters ) { FunctionBody }

        [...]
        3. Let F be FunctionCreate(Normal, FormalParameters, FunctionBody,
           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

    [...]
    3. If Initializer is present and v is undefined, then
       a. Let defaultValue be the result of evaluating Initializer.
       b. Let v be GetValue(defaultValue).
       c. ReturnIfAbrupt(v).
    4. Return the result of performing BindingInitialization for BindingPattern
       passing v and environment as arguments.
---*/

var callCount = 0;
function f({ w: [x, y, z] = [4, 5, 6] } = {}) {
  assert.sameValue(x, 4);
  assert.sameValue(y, 5);
  assert.sameValue(z, 6);

  assert.throws(ReferenceError, function() {
    w;
  });
  callCount = callCount + 1;
};
f();
assert.sameValue(callCount, 1, 'function invoked exactly once');