JSTests/test262/test/language/expressions/function/dstr/ary-ptrn-elem-ary-empty-init.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/ary-ptrn-elem-ary-empty-init.case
// - src/dstr-binding/default/func-expr.template
/*---
description: BindingElement with array binding pattern and initializer is used (function expression)
esid: sec-function-definitions-runtime-semantics-evaluation
es6id: 14.1.20
features: [generators, destructuring-binding]
flags: [generated]
info: |
    FunctionExpression : function ( FormalParameters ) { FunctionBody }

        [...]
        3. Let closure 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.
    [...]

    13.3.3.6 Runtime Semantics: IteratorBindingInitialization

    BindingElement : BindingPatternInitializer opt

    [...]
    2. If iteratorRecord.[[done]] is true, let v be undefined.
    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).
    4. Return the result of performing BindingInitialization of BindingPattern
       with v and environment as the arguments.

---*/
var initCount = 0;
var iterCount = 0;
var iter = function*() { iterCount += 1; }();

var callCount = 0;
var f;
f = function([[] = function() { initCount += 1; return iter; }()]) {
  assert.sameValue(initCount, 1);
  assert.sameValue(iterCount, 0);
  callCount = callCount + 1;
};

f([]);
assert.sameValue(callCount, 1, 'function invoked exactly once');