test262/test/language/statements/for-of/dstr-array-rest-lref.js

74 lines
2.2 KiB
JavaScript

// This file was procedurally generated from the following sources:
// - src/dstr-assignment/array-rest-lref.case
// - src/dstr-assignment/default/for-of.template
/*---
description: Reference is evaluated during assignment (For..of statement)
esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
es6id: 13.7.5.11
features: [Symbol.iterator, destructuring-binding]
flags: [generated]
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.
[...]
ArrayAssignmentPattern : [ Elisionopt AssignmentRestElement ]
[...]
5. Let result be the result of performing
IteratorDestructuringAssignmentEvaluation of AssignmentRestElement with
iteratorRecord as the argument
6. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
result).
AssignmentRestElement[Yield] : ... DestructuringAssignmentTarget
1. If DestructuringAssignmentTarget is neither an ObjectLiteral nor an
ArrayLiteral, then
a. Let lref be the result of evaluating DestructuringAssignmentTarget.
b. ReturnIfAbrupt(lref).
[...]
---*/
var nextCount = 0;
var returnCount = 0;
var iterable = {};
var iterator = {
next: function() {
nextCount += 1;
return { done: true };
},
return: function() {
returnCount += 1;
}
};
var obj = {};
iterable[Symbol.iterator] = function() {
return iterator;
};
var counter = 0;
for ([...obj['a' + 'b']] of [iterable]) {
assert.sameValue(nextCount, 1);
assert.sameValue(returnCount, 0);
assert(!!obj.ab);
assert.sameValue(obj.ab.length, 0);
counter += 1;
}
assert.sameValue(counter, 1);