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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 | |
18 static void forEach(Iterable iterable, void f(o)) { | 11 static void forEach(Iterable iterable, void f(o)) { |
19 for (final e in iterable) { | 12 for (final e in iterable) { |
20 f(e); | 13 f(e); |
21 } | 14 } |
22 } | 15 } |
23 | 16 |
24 static bool some(Iterable iterable, bool f(o)) { | 17 static bool some(Iterable iterable, bool f(o)) { |
25 for (final e in iterable) { | 18 for (final e in iterable) { |
26 if (f(e)) return true; | 19 if (f(e)) return true; |
27 } | 20 } |
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153 * Returns true if the specified collection contains the specified object | 146 * Returns true if the specified collection contains the specified object |
154 * reference. | 147 * reference. |
155 */ | 148 */ |
156 static _containsRef(Collection c, Object ref) { | 149 static _containsRef(Collection c, Object ref) { |
157 for (var e in c) { | 150 for (var e in c) { |
158 if (e === ref) return true; | 151 if (e === ref) return true; |
159 } | 152 } |
160 return false; | 153 return false; |
161 } | 154 } |
162 } | 155 } |
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