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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 { |
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47 static List filter(Iterable<Object> source, | 47 static List filter(Iterable<Object> source, |
48 List<Object> destination, | 48 List<Object> destination, |
49 bool f(o)) { | 49 bool f(o)) { |
50 for (final e in source) { | 50 for (final e in source) { |
51 if (f(e)) destination.add(e); | 51 if (f(e)) destination.add(e); |
52 } | 52 } |
53 return destination; | 53 return destination; |
54 } | 54 } |
55 | 55 |
56 static bool isEmpty(Iterable<Object> iterable) { | 56 static bool isEmpty(Iterable<Object> iterable) { |
57 return !iterable.iterator().hasNext(); | 57 return !iterable.iterator().hasNext; |
58 } | 58 } |
59 } | 59 } |
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