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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 /** | 5 /** |
6 * The [Collections] class implements static methods useful when | 6 * The [Collections] class implements static methods useful when |
7 * writing a class that implements [Collection] and the [iterator] | 7 * writing a class that implements [Collection] and the [iterator] |
8 * method. | 8 * method. |
9 */ | 9 */ |
10 class _Collections { | 10 class _Collections { |
| 11 static bool contains(Iterable<Object> iterable, Object element) { |
| 12 for (final e in iterable) { |
| 13 if (e == element) return true; |
| 14 } |
| 15 return false; |
| 16 } |
| 17 |
11 static void forEach(Iterable<Object> iterable, void f(Object o)) { | 18 static void forEach(Iterable<Object> iterable, void f(Object o)) { |
12 for (final e in iterable) { | 19 for (final e in iterable) { |
13 f(e); | 20 f(e); |
14 } | 21 } |
15 } | 22 } |
16 | 23 |
17 static List map(Iterable<Object> source, | 24 static List map(Iterable<Object> source, |
18 List<Object> destination, | 25 List<Object> destination, |
19 f(o)) { | 26 f(o)) { |
20 for (final e in source) { | 27 for (final e in source) { |
(...skipping 22 matching lines...) Expand all Loading... |
43 for (final e in source) { | 50 for (final e in source) { |
44 if (f(e)) destination.add(e); | 51 if (f(e)) destination.add(e); |
45 } | 52 } |
46 return destination; | 53 return destination; |
47 } | 54 } |
48 | 55 |
49 static bool isEmpty(Iterable<Object> iterable) { | 56 static bool isEmpty(Iterable<Object> iterable) { |
50 return !iterable.iterator().hasNext(); | 57 return !iterable.iterator().hasNext(); |
51 } | 58 } |
52 } | 59 } |
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