JSTests/test262/test/language/statements/for/dstr/var-ary-ptrn-rest-id-elision.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/ary-ptrn-rest-id-elision.case
// - src/dstr-binding/default/for-var.template
/*---
description: Rest element following elision elements (for statement)
esid: sec-for-statement-runtime-semantics-labelledevaluation
features: [destructuring-binding]
flags: [generated]
info: |
    IterationStatement :
        for ( var VariableDeclarationList ; Expressionopt ; Expressionopt ) Statement

    1. Let varDcl be the result of evaluating VariableDeclarationList.
    [...]

    13.3.2.4 Runtime Semantics: Evaluation

    VariableDeclarationList : VariableDeclarationList , VariableDeclaration

    1. Let next be the result of evaluating VariableDeclarationList.
    2. ReturnIfAbrupt(next).
    3. Return the result of evaluating VariableDeclaration.

    VariableDeclaration : BindingPattern Initializer

    1. Let rhs be the result of evaluating Initializer.
    2. Let rval be GetValue(rhs).
    3. ReturnIfAbrupt(rval).
    4. Return the result of performing BindingInitialization for BindingPattern
       passing rval and undefined as arguments.

    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
    ArrayBindingPattern : [ Elisionopt BindingRestElement ]
    1. If Elision is present, then
       a. Let status be the result of performing
          IteratorDestructuringAssignmentEvaluation of Elision with
          iteratorRecord as the argument.
       b. ReturnIfAbrupt(status).
    2. Return the result of performing IteratorBindingInitialization for
       BindingRestElement with iteratorRecord and environment as arguments.
---*/
var values = [1, 2, 3, 4, 5];

var iterCount = 0;

for (var [ , , ...x] = values; iterCount < 1; ) {
  assert(Array.isArray(x));
  assert.sameValue(x.length, 3);
  assert.sameValue(x[0], 3);
  assert.sameValue(x[1], 4);
  assert.sameValue(x[2], 5);
  assert.notSameValue(x, values);
  iterCount += 1;
}

assert.sameValue(iterCount, 1, 'Iteration occurred as expected');