Joshua Litt
20faaa5d94
Change-Id: Ib18f554c1076f27a3f7c0df5a36410da41a1f467 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/148784 Reviewed-by: Paul Berry <paulberry@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>
85 lines
2.8 KiB
Dart
85 lines
2.8 KiB
Dart
// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// @dart = 2.7
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/*member: main:[null]*/
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main() {
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forInDirect();
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forInReturn();
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forInReturnMulti();
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forInReturnNonNull();
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}
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////////////////////////////////////////////////////////////////////////////////
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// For-in loop directly on a list literal.
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////////////////////////////////////////////////////////////////////////////////
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/*member: forInDirect:[null]*/
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forInDirect() {
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/*iterator: Container([exact=JSExtendableArray], element: [exact=JSUInt31], length: 3)*/
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/*current: [exact=ArrayIterator]*/
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/*moveNext: [exact=ArrayIterator]*/
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for (var a in [1, 2, 3]) {
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print(a);
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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// Return element from a for-in loop on a list literal.
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////////////////////////////////////////////////////////////////////////////////
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/*member: forInReturn:[null|subclass=JSInt]*/
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forInReturn() {
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/*iterator: Container([exact=JSExtendableArray], element: [exact=JSUInt31], length: 3)*/
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/*current: [exact=ArrayIterator]*/
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/*moveNext: [exact=ArrayIterator]*/
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for (var a in [1, 2, 3]) {
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// TODO(johnniwinther): We should know the type of [a] here.
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return a;
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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// Return element from a for-in loop on known list type.
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////////////////////////////////////////////////////////////////////////////////
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/*member: _forInReturn:[null|subclass=Object]*/
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_forInReturn(
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/*Container([exact=JSExtendableArray], element: [exact=JSUInt31], length: null)*/ list) {
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/*iterator: Container([exact=JSExtendableArray], element: [exact=JSUInt31], length: null)*/
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/*current: [exact=ArrayIterator]*/
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/*moveNext: [exact=ArrayIterator]*/
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for (var a in list) {
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// TODO(johnniwinther): We should know the type of [a] here.
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return a;
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}
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}
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/*member: forInReturnMulti:[null]*/
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forInReturnMulti() {
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_forInReturn([1, 2]);
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_forInReturn([1, 2, 3]);
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}
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////////////////////////////////////////////////////////////////////////////////
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// Sequentially refine that an element is not null and return it from a for-in
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// loop on known list type.
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////////////////////////////////////////////////////////////////////////////////
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/*member: forInReturnNonNull:[subclass=JSInt]*/
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forInReturnNonNull() {
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/*iterator: Container([exact=JSExtendableArray], element: [exact=JSUInt31], length: 3)*/
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/*current: [exact=ArrayIterator]*/
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/*moveNext: [exact=ArrayIterator]*/
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for (var a in [1, 2, 3]) {
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// TODO(johnniwinther): We should know the type of [a] here. Even if [a] has
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// type `dynamic`.
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a. /*[null|subclass=JSInt]*/ isEven;
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a. /*[subclass=JSInt]*/ isEven;
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return a;
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}
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return 0;
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}
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