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https://github.com/google/quiver-dart

A set of utility libraries for Dart
https://github.com/google/quiver-dart

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A set of utility libraries for Dart

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README 

        
A set of utility libraries for Dart that makes using many Dart libraries easier

and more convenient, or adds additional functionality.



[![Build Status](https://github.com/google/quiver-dart/workflows/Dart%20CI/badge.svg)](https://github.com/google/quiver-dart/actions?query=workflow%3A"Dart+CI"+branch%3Amaster)

[![Coverage Status](https://img.shields.io/coveralls/google/quiver-dart.svg)](https://coveralls.io/r/google/quiver-dart)

[![Pub](https://img.shields.io/pub/v/quiver.svg)](https://pub.dev/packages/quiver)



## Documentation



[API Docs](https://pub.dev/documentation/quiver/latest/) are available.



## Main Libraries



## [quiver.async][]



Utilities for working with Futures, Streams and async computations.



`collect` collects the completion events of an `Iterable` of `Future`s into a

`Stream`.



`enumerate` and `concat` represent `Stream` versions of the same-named

[quiver.iterables][] methods.



`StreamBuffer` allows for the orderly reading of elements from a stream, such as

a socket.



`FutureStream` turns a `Future` into a `Stream` which emits the same

events as the stream returned from the future.



`StreamRouter` splits a Stream into multiple streams based on a set of

predicates.



`CountdownTimer` is a simple countdown timer that fires events in regular

increments.



`Metronome` is a self-correcting alternative to `Timer.periodic`. It provides a

simple, tracking periodic stream of `DateTime` events with optional anchor time.



`stringFromByteStream` constructs a string from a stream of byte lists.



[quiver.async]:

  https://pub.dev/documentation/quiver/latest/quiver.async/quiver.async-library.html



## [quiver.cache][]



`Cache` is a semi-persistent, asynchronously accessed, mapping of keys to

values. Caches are similar to Maps, except that the cache implementation might

store values in a remote system, so all operations are asynchronous, and caches

might have eviction policies.



`MapCache` is a Cache implementation backed by a Map.



[quiver.cache]:

  https://pub.dev/documentation/quiver/latest/quiver.cache/quiver.cache-library.html



## [quiver.check][]



`checkArgument` throws `ArgumentError` if the specified argument check

expression is false.



`checkListIndex` throws `RangeError` if the specified index is out of bounds.



`checkState` throws `StateError` if the specified state check expression is

false.



[quiver.check]:

  https://pub.dev/documentation/quiver/latest/quiver.check/quiver.check-library.html



## [quiver.collection][]



`listsEqual`, `mapsEqual` and `setsEqual` check collections for equality.



`indexOf` finds the first index of an item satisfying a predicate.



`LruMap` is a map that removes the least recently used item when a threshold

length is exceeded.



`Multimap` is an associative collection that maps keys to collections of values.



`BiMap` is a bidirectional map and provides an inverse view, allowing lookup of

key by value.



`TreeSet` is a balanced binary tree that offers a bidirectional iterator, the

ability to iterate from an arbitrary anchor, and 'nearest' search.



[quiver.collection]:

  https://pub.dev/documentation/quiver/latest/quiver.collection/quiver.collection-library.html



## [quiver.core][]



`Optional` is a way to represent optional values without allowing `null`.



`hashObjects`, `hash2`, `hash3`, and `hash4` generate high-quality hashCodes for

a list of objects, or 2, 3, or 4 arguments respectively.



[quiver.core]:

  https://pub.dev/documentation/quiver/latest/quiver.core/quiver.core-library.html



## [quiver.iterables][]



`concat`, `count`, `cycle`, `enumerate`, `merge`, `partition`, `range`, and

`zip` create, transform, or combine Iterables in different ways, similar to

Python's itertools.



`min`, `max`, and `extent` retrieve the minimum and maximum elements from an

iterable.



`GeneratingIterable` is an easy way to create lazy iterables that produce

elements by calling a function. A common use-case is to traverse properties in

an object graph, like the parent relationship in a tree.



`InfiniteIterable` is a base class for Iterables that throws on operations that

require a finite length.



[quiver.iterables]:

  https://pub.dev/documentation/quiver/latest/quiver.iterables/quiver.iterables-library.html



## [quiver.pattern][]



pattern.dart container utilities for work with `Pattern`s and `RegExp`s.



`Glob` implements glob patterns that are commonly used with filesystem paths.



`matchesAny` combines multiple Patterns into one, and allows for exclusions.



`matchesFull` returns true if a Pattern matches an entire String.



`escapeRegex` escapes special regex characters in a String so that it can be

used as a literal match inside of a RegExp.



[quiver.pattern]:

  https://pub.dev/documentation/quiver/latest/quiver.pattern/quiver.pattern-library.html



## [quiver.strings][]



`isBlank` checks if a string is `null`, empty or made of whitespace characters.



`isNotBlank` checks if a string is not `null`, and not blank.



`isEmpty` checks if a string is `null` or empty.



`isNotEmpty` checks if a string is not `null` and not empty.



`equalsIgnoreCase` checks if two strings are equal, ignoring case.



`compareIgnoreCase` compares two strings, ignoring case.



`loop` allows you to loop through characters in a string starting and ending at

arbitrary indices. Out of bounds indices allow you to wrap around the string,

supporting a number of use-cases, including:



- Rotating: `loop('lohel', -3, 2) => 'hello'`

- Repeating, like `String`'s `operator*`, but with better character-level

  control, e.g.: `loop('la ', 0, 8) => 'la la la' // no trailing space`

- Tailing: `loop('/path/to/some/file.txt', -3) => 'txt'`

- Reversing: `loop('top', 3, 0) => 'pot'`



[quiver.strings]:

  https://pub.dev/documentation/quiver/latest/quiver.strings/quiver.strings-library.html



## [quiver.time][]



`Clock` provides points in time relative to the current point in time, for

example: now, 2 days ago, 4 weeks from now, etc. For testability, use Clock

rather than other ways of accessing time, like `new DateTime()`, so that you can

use a fake time function in your tests to control time.



`Now` is a typedef for functions that return the current time in microseconds,

since Clock deals in DateTime which only have millisecond accuracy.



`aMicrosecond`, `aMillisecond`, `aSecond`, `aMinute`, `anHour`, `aDay`, and

`aWeek` are unit duration constants to allow writing for example:



- `aDay` vs. `const Duration(days: 1)`

- `aSecond * 30` vs. `const Duration(seconds: 30)`



[quiver.time]:

  https://pub.dev/documentation/quiver/latest/quiver.time/quiver.time-library.html



## Testing Libraries



The Quiver testing libraries are intended to be used in testing code, not

production code. It currently consists of fake implementations of some Quiver

interfaces.



## [quiver.testing.async][]



`FakeAsync` enables testing of units which depend upon timers and microtasks. It

supports fake advancements of time and the microtask queue, which cause fake

timers and microtasks to be processed. A `Clock` is provided from which to read

the current fake time. Faking synchronous or blocking time advancement is also

supported.



[quiver.testing.async]:

  https://pub.dev/documentation/quiver/latest/quiver.testing.async/quiver.testing.async-library.html



## [quiver.testing.equality][]



`areEqualityGroups` is a matcher that supports testing `operator==` and

`hashCode` implementations.



[quiver.testing.equality]:

  https://pub.dev/documentation/quiver/latest/quiver.testing.equality/quiver.testing.equality-library.html



## [quiver.testing.time][]



`FakeStopwatch` is a Stopwatch that uses a provided `now()` function to get the

current time.



[quiver.testing.time]:

  https://pub.dev/documentation/quiver/latest/quiver.testing.time/quiver.testing.time-library.html