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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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| 35 return true; | 35 return true; |
| 36 } | 36 } |
| 37 | 37 |
| 38 static List map(Iterable source, List destination, f(o)) { | 38 static List map(Iterable source, List destination, f(o)) { |
| 39 for (final e in source) { | 39 for (final e in source) { |
| 40 destination.add(f(e)); | 40 destination.add(f(e)); |
| 41 } | 41 } |
| 42 return destination; | 42 return destination; |
| 43 } | 43 } |
| 44 | 44 |
| 45 static Dynamic reduce(Iterable iterable, | 45 static dynamic reduce(Iterable iterable, |
| 46 Dynamic initialValue, | 46 dynamic initialValue, |
| 47 Dynamic combine(Dynamic previousValue, element)) { | 47 dynamic combine(dynamic previousValue, element)) { |
| 48 for (final element in iterable) { | 48 for (final element in iterable) { |
| 49 initialValue = combine(initialValue, element); | 49 initialValue = combine(initialValue, element); |
| 50 } | 50 } |
| 51 return initialValue; | 51 return initialValue; |
| 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 } |
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| 155 * Returns true if the specified collection contains the specified object | 155 * Returns true if the specified collection contains the specified object |
| 156 * reference. | 156 * reference. |
| 157 */ | 157 */ |
| 158 static _containsRef(Collection c, Object ref) { | 158 static _containsRef(Collection c, Object ref) { |
| 159 for (var e in c) { | 159 for (var e in c) { |
| 160 if (e === ref) return true; | 160 if (e === ref) return true; |
| 161 } | 161 } |
| 162 return false; | 162 return false; |
| 163 } | 163 } |
| 164 } | 164 } |
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