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fc1b1ecc71
Change-Id: Idbcc965a27e9ffeedf5e0a1068b019de4193070f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/127745 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: Alexander Thomas <athom@google.com>
72 lines
1.8 KiB
Dart
72 lines
1.8 KiB
Dart
// Copyright (c) 2011, 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 test program for testing for statement which captures loop variable.
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import "package:expect/expect.dart";
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var f;
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main() {
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// Capture the loop variable, ensure we capture the right value.
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for (int i = 0; i < 10; i++) {
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if (i == 7) {
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f = () => "i = $i";
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}
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}
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Expect.equals("i = 7", f());
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// There is only one instance of k. The captured variable continues
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// to change.
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int k;
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for (k = 0; k < 10; k++) {
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if (k == 7) {
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f = () => "k = $k";
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}
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}
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Expect.equals("k = 10", f());
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// l gets modified after it's captured. n++ is executed on the
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// newly introduced instance of n (i.e. the instance of the loop
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// iteration after the value is captured).
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for (int n = 0; n < 10; n++) {
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var l = n;
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if (l == 7) {
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f = () => "l = $l, n = $n";
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}
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l++;
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}
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Expect.equals("l = 8, n = 7", f());
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// Loop variable is incremented in loop body instead of the increment.
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// expression. Thus, the captured value is incremented by one before
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// a new loop variable instance is created.
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for (int i = 0; i < 10; /*nothing*/) {
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if (i == 7) {
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f = () => "i = $i";
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}
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i++;
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}
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Expect.equals("i = 8", f());
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// Make sure continue still ensures the loop variable is captured correctly.
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for (int i = 0; i < 10; i++) {
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if (i == 7) {
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f = () => "i = $i";
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}
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continue;
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i++;
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}
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Expect.equals("i = 7", f());
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// Nested loops with captured variables.
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for (int k = 0; k < 5; k++) {
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for (int i = 0; i < 10; i++) {
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if (k == 3 && i == 7) {
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f = () => "k = $k, i = $i";
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}
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}
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}
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Expect.equals("k = 3, i = 7", f());
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}
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