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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 { |
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52 } | 52 } |
53 | 53 |
54 static List filter(Iterable source, List destination, bool f(o)) { | 54 static List filter(Iterable source, List destination, bool f(o)) { |
55 for (final e in source) { | 55 for (final e in source) { |
56 if (f(e)) destination.add(e); | 56 if (f(e)) destination.add(e); |
57 } | 57 } |
58 return destination; | 58 return destination; |
59 } | 59 } |
60 | 60 |
61 static bool isEmpty(Iterable iterable) { | 61 static bool isEmpty(Iterable iterable) { |
62 return !iterable.iterator().hasNext(); | 62 return !iterable.iterator().hasNext; |
63 } | 63 } |
64 | 64 |
65 // TODO(jjb): visiting list should be an identityHashSet when it exists | 65 // TODO(jjb): visiting list should be an identityHashSet when it exists |
66 | 66 |
67 /** | 67 /** |
68 * Returns a string representing the specified collection. If the | 68 * Returns a string representing the specified collection. If the |
69 * collection is a [List], the returned string looks like this: | 69 * collection is a [List], the returned string looks like this: |
70 * [:'[element0, element1, ... elementN]':]. The value returned by its | 70 * [:'[element0, element1, ... elementN]':]. The value returned by its |
71 * [toString] method is used to represent each element. If the specified | 71 * [toString] method is used to represent each element. If the specified |
72 * collection is not a list, the returned string looks like this: | 72 * collection is not a list, the returned string looks like this: |
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153 * Returns true if the specified collection contains the specified object | 153 * Returns true if the specified collection contains the specified object |
154 * reference. | 154 * reference. |
155 */ | 155 */ |
156 static _containsRef(Collection c, Object ref) { | 156 static _containsRef(Collection c, Object ref) { |
157 for (var e in c) { | 157 for (var e in c) { |
158 if (e === ref) return true; | 158 if (e === ref) return true; |
159 } | 159 } |
160 return false; | 160 return false; |
161 } | 161 } |
162 } | 162 } |
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