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| 1 Helper libraries for working with collections. | 1 Deprecated helper libraries for working with collections. |
| 2 | 2 |
| 3 The `collection_helpers` package contains a number of separate libraries | 3 The `collection_helpers` package has been split into the |
| 4 with utility functions and classes that makes working with collections easier. | 4 `collection` package (for most of the library) |
| 5 and the `typed_data` package (for typed data buffers). |
| 5 | 6 |
| 6 ## Using | 7 All further development will happen on those libraries. |
| 7 | 8 |
| 8 The `collection_helpers` library can be imported as separate libraries, or | 9 Please start using those libraries directly. |
| 9 in totality: | |
| 10 | |
| 11 import 'package:collection_helpers/equality.dart'; | |
| 12 import 'package:collection_helpers/algorithms.dart'; | |
| 13 import 'package:collection_helpers/wrappers.dart'; | |
| 14 | |
| 15 or | |
| 16 | |
| 17 import 'package:collection_helpers/all.dart'; | |
| 18 | |
| 19 ## Equality | |
| 20 | |
| 21 The equality library gives a way to specify equality of elements and | |
| 22 collections. | |
| 23 | |
| 24 Collections in Dart have no inherent equality. Two sets are not equal, even | |
| 25 if they contain exactly the same objects as elements. | |
| 26 | |
| 27 The equality library provides a way to say define such an equality. In this | |
| 28 case, for example, `const SetEquality(const IdentityEquality())` is an equality | |
| 29 that considers two sets equal exactly if they contain identical elements. | |
| 30 | |
| 31 The library provides ways to define equalities on `Iterable`s, `List`s, `Set`s,
and | |
| 32 `Map`s, as well as combinations of these, such as: | |
| 33 | |
| 34 const MapEquality(const IdentityEquality(), const ListEquality()); | |
| 35 | |
| 36 This equality considers maps equal if they have identical keys, and the correspo
nding values are lists with equal (`operator==`) values. | |
| 37 | |
| 38 ## Algorithms | |
| 39 | |
| 40 The algorithms library contains functions that operate on lists. | |
| 41 | |
| 42 It contains ways to shuffle a `List`, do binary search on a sorted `List`, and | |
| 43 some different sorting algorithms. | |
| 44 | |
| 45 | |
| 46 ## Wrappers | |
| 47 | |
| 48 The wrappers library contains classes that "wrap" a collection. | |
| 49 | |
| 50 A wrapper class contains an object of the same type, and it forwards all | |
| 51 methods to the wrapped object. | |
| 52 | |
| 53 Wrapper classes can be used in various ways, for example to restrict the type | |
| 54 of an object to that of a supertype, or to change the behavior of selected | |
| 55 functions on an existing object. | |
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