obj-rest-order.js - mozsearch

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// This file was procedurally generated from the following sources:

// - src/dstr-assignment/obj-rest-order.case

// - src/dstr-assignment/default/for-of.template

/*---

description: Rest operation follows [[OwnPropertyKeys]] order (For..of statement)

esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation

features: [Symbol, object-rest, destructuring-binding]

flags: [generated]

includes: [compareArray.js]

info: |

    IterationStatement :

      for ( LeftHandSideExpression of AssignmentExpression ) Statement

    1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« »,

       AssignmentExpression, iterate).

    2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,

       keyResult, assignment, labelSet).

    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation

    [...]

    4. If destructuring is true and if lhsKind is assignment, then

       a. Assert: lhs is a LeftHandSideExpression.

       b. Let assignmentPattern be the parse of the source text corresponding to

          lhs using AssignmentPattern as the goal symbol.

    [...]

---*/

var rest;

var calls = [];

var o = { get z() { calls.push('z') }, get a() { calls.push('a') } };

Object.defineProperty(o, 1, { get: () => { calls.push(1) }, enumerable: true });

Object.defineProperty(o, Symbol('foo'), { get: () => { calls.push("Symbol(foo)") }, enumerable: true });

var counter = 0;

for ({...rest} of [o]) {

  assert.compareArray(calls, [1, 'z', 'a', "Symbol(foo)"]);

  assert.sameValue(Object.keys(rest).length, 3);

  counter += 1;

assert.sameValue(counter, 1);

reportCompare(0, 0);