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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 { |
(...skipping 10 matching lines...) Expand all Loading... |
21 return false; | 21 return false; |
22 } | 22 } |
23 | 23 |
24 static bool every(Iterable<Object> iterable, bool f(Object o)) { | 24 static bool every(Iterable<Object> iterable, bool f(Object o)) { |
25 for (final e in iterable) { | 25 for (final e in iterable) { |
26 if (!f(e)) return false; | 26 if (!f(e)) return false; |
27 } | 27 } |
28 return true; | 28 return true; |
29 } | 29 } |
30 | 30 |
| 31 static List<Object> map(Iterable<Object> source, |
| 32 List<Object> destination, |
| 33 f(Object o)) { |
| 34 for (final e in source) { |
| 35 destination.add(f(e)); |
| 36 } |
| 37 return destination; |
| 38 } |
| 39 |
31 static List<Object> filter(Iterable<Object> source, | 40 static List<Object> filter(Iterable<Object> source, |
32 List<Object> destination, | 41 List<Object> destination, |
33 bool f(Object o)) { | 42 bool f(Object o)) { |
34 for (final e in source) { | 43 for (final e in source) { |
35 if (f(e)) destination.add(e); | 44 if (f(e)) destination.add(e); |
36 } | 45 } |
37 return destination; | 46 return destination; |
38 } | 47 } |
39 | 48 |
40 static bool isEmpty(Iterable<Object> iterable) { | 49 static bool isEmpty(Iterable<Object> iterable) { |
41 return !iterable.iterator().hasNext(); | 50 return !iterable.iterator().hasNext(); |
42 } | 51 } |
43 } | 52 } |
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