OLD | NEW |
| (Empty) |
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 | |
3 // BSD-style license that can be found in the LICENSE file. | |
4 | |
5 part of html; | |
6 | |
7 /** | |
8 * The [Collections] class implements static methods useful when | |
9 * writing a class that implements [Collection] and the [iterator] | |
10 * method. | |
11 */ | |
12 class _Collections { | |
13 static bool contains(Iterable<Object> iterable, Object element) { | |
14 for (final e in iterable) { | |
15 if (e == element) return true; | |
16 } | |
17 return false; | |
18 } | |
19 | |
20 static void forEach(Iterable<Object> iterable, void f(Object o)) { | |
21 for (final e in iterable) { | |
22 f(e); | |
23 } | |
24 } | |
25 | |
26 static List map(Iterable<Object> source, | |
27 List<Object> destination, | |
28 f(o)) { | |
29 for (final e in source) { | |
30 destination.add(f(e)); | |
31 } | |
32 return destination; | |
33 } | |
34 | |
35 static bool some(Iterable<Object> iterable, bool f(Object o)) { | |
36 for (final e in iterable) { | |
37 if (f(e)) return true; | |
38 } | |
39 return false; | |
40 } | |
41 | |
42 static bool every(Iterable<Object> iterable, bool f(Object o)) { | |
43 for (final e in iterable) { | |
44 if (!f(e)) return false; | |
45 } | |
46 return true; | |
47 } | |
48 | |
49 static List filter(Iterable<Object> source, | |
50 List<Object> destination, | |
51 bool f(o)) { | |
52 for (final e in source) { | |
53 if (f(e)) destination.add(e); | |
54 } | |
55 return destination; | |
56 } | |
57 | |
58 static bool isEmpty(Iterable<Object> iterable) { | |
59 return !iterable.iterator().hasNext; | |
60 } | |
61 } | |
OLD | NEW |