Clone this repo:
  1. e4bb038 Update pubspec.yaml by Kevin Moore · 17 hours ago master
  2. 306e555 Fix typo in expandIndexed (#160) by Nate Bosch · 22 hours ago
  3. f74a4e1 remove git overrdies (#163) by Jacob MacDonald · 5 days ago 1.15.0-nullsafety.4
  4. f74a29b Allow prerelease versions of the 2.12 sdk (#162) by Jacob MacDonald · 5 days ago
  5. 60e6ee2 Add `choose` extension method to iterable, choosing a number of elements at random. (#158) by Lasse R.H. Nielsen · 3 weeks ago

Contains utility functions and classes in the style of dart:collection to make working with collections easier.


The package contains functions that operate on lists.

It contains ways to shuffle a List, do binary search on a sorted List, and various sorting algorithms.


The package provides a way to specify the equality of elements and collections.

Collections in Dart have no inherent equality. Two sets are not equal, even if they contain exactly the same objects as elements.

The Equality interface provides a way to define such an equality. In this case, for example, const SetEquality(const IdentityEquality()) is an equality that considers two sets equal exactly if they contain identical elements.

Equalities are provided for Iterables, Lists, Sets, and Maps, as well as combinations of these, such as:

const MapEquality(const IdentityEquality(), const ListEquality());

This equality considers maps equal if they have identical keys, and the corresponding values are lists with equal (operator==) values.

Iterable Zip

Utilities for “zipping” a list of iterables into an iterable of lists.

Priority Queue

An interface and implementation of a priority queue.


The package contains classes that “wrap” a collection.

A wrapper class contains an object of the same type, and it forwards all methods to the wrapped object.

Wrapper classes can be used in various ways, for example to restrict the type of an object to that of a supertype, or to change the behavior of selected functions on an existing object.

Features and bugs

Please file feature requests and bugs at the issue tracker.