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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, 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 iterable, var element) { |
| 12 for (final e in iterable) { |
| 13 if (element == e) return true; |
| 14 } |
| 15 return false; |
| 16 } |
| 17 |
11 static void forEach(Iterable iterable, void f(o)) { | 18 static void forEach(Iterable iterable, void f(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 bool some(Iterable iterable, bool f(o)) { | 24 static bool some(Iterable iterable, bool f(o)) { |
18 for (final e in iterable) { | 25 for (final e in iterable) { |
19 if (f(e)) return true; | 26 if (f(e)) return true; |
20 } | 27 } |
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146 * Returns true if the specified collection contains the specified object | 153 * Returns true if the specified collection contains the specified object |
147 * reference. | 154 * reference. |
148 */ | 155 */ |
149 static _containsRef(Collection c, Object ref) { | 156 static _containsRef(Collection c, Object ref) { |
150 for (var e in c) { | 157 for (var e in c) { |
151 if (e === ref) return true; | 158 if (e === ref) return true; |
152 } | 159 } |
153 return false; | 160 return false; |
154 } | 161 } |
155 } | 162 } |
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