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Side by Side Diff: sdk/lib/collection/maps.dart

Issue 15263004: Adding isNotEmpty property to collection and string. (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Fix template generation Created 7 years, 7 months ago
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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 part of dart.collection; 5 part of dart.collection;
6 6
7 /* 7 /*
8 * Helper class which implements complex [Map] operations 8 * Helper class which implements complex [Map] operations
9 * in term of basic ones ([Map.keys], [Map.operator []], 9 * in term of basic ones ([Map.keys], [Map.operator []],
10 * [Map.operator []=] and [Map.remove].) Not all methods are 10 * [Map.operator []=] and [Map.remove].) Not all methods are
(...skipping 40 matching lines...) Expand 10 before | Expand all | Expand 10 after
51 } 51 }
52 52
53 static Iterable getValues(Map map) { 53 static Iterable getValues(Map map) {
54 return map.keys.map((key) => map[key]); 54 return map.keys.map((key) => map[key]);
55 } 55 }
56 56
57 static int length(Map map) => map.keys.length; 57 static int length(Map map) => map.keys.length;
58 58
59 static bool isEmpty(Map map) => map.keys.isEmpty; 59 static bool isEmpty(Map map) => map.keys.isEmpty;
60 60
61 static bool isNotEmpty(Map map) => map.keys.isNotEmpty;
62
61 /** 63 /**
62 * Returns a string representing the specified map. The returned string 64 * Returns a string representing the specified map. The returned string
63 * looks like this: [:'{key0: value0, key1: value1, ... keyN: valueN}':]. 65 * looks like this: [:'{key0: value0, key1: value1, ... keyN: valueN}':].
64 * The value returned by its [toString] method is used to represent each 66 * The value returned by its [toString] method is used to represent each
65 * key or value. 67 * key or value.
66 * 68 *
67 * If the map collection contains a reference to itself, either 69 * If the map collection contains a reference to itself, either
68 * directly as a key or value, or indirectly through other collections 70 * directly as a key or value, or indirectly through other collections
69 * or maps, the contained reference is rendered as [:'{...}':]. This 71 * or maps, the contained reference is rendered as [:'{...}':]. This
70 * prevents the infinite regress that would otherwise occur. So, for example, 72 * prevents the infinite regress that would otherwise occur. So, for example,
71 * calling this method on a map whose sole entry maps the string key 'me' 73 * calling this method on a map whose sole entry maps the string key 'me'
72 * to a reference to the map would return [:'{me: {...}}':]. 74 * to a reference to the map would return [:'{me: {...}}':].
73 * 75 *
74 * A typical implementation of a map's [toString] method will 76 * A typical implementation of a map's [toString] method will
75 * simply return the results of this method applied to the collection. 77 * simply return the results of this method applied to the collection.
76 */ 78 */
77 static String mapToString(Map m) => ToString.mapToString(m); 79 static String mapToString(Map m) => ToString.mapToString(m);
78 } 80 }
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