The latest tweets from @QuiverUs. What does quiver mean? To shake with a slight, rapid, tremulous movement. Hip and pocket quivers are popular archery quivers for target shooters. While hip quivers typically are carried on a belt, pocket quivers attach to your pocket. These target quivers allow easy access to your arrows, and are take weight off your bow, which is important in target archery.
Quiver is a set of utility libraries for Dart that makes using many Dartlibraries easier and more convenient, or adds additional functionality.
Documentation #
API Docs are available.
Main Libraries #
Utilities for working with Futures, Streams and async computations.
collect collects the completion events of an Iterable of Futures into aStream.
enumerate and concat represent Stream versions of the same-namedquiver.iterables methods.
StreamBuffer allows for the orderly reading of elements from a stream, suchas a socket.
FutureStream turns a Future<Stream> into a Stream which emits the sameevents as the stream returned from the future.
StreamRouter splits a Stream into multiple streams based on a set ofpredicates.
CountdownTimer is a simple countdown timer that fires events in regularincrements.
Metronome is a self-correcting alternative to Timer.periodic. It providesa simple, tracking periodic stream of DateTime events with optional anchortime.
stringFromByteStream constructs a string from a stream of byte lists.
Cache is a semi-persistent, asynchronously accessed, mapping of keys tovalues. Caches are similar to Maps, except that the cache implementation mightstore values in a remote system, so all operations are asynchronous, and cachesmight have eviction policies.
MapCache is a Cache implementation backed by a Map.
checkArgument throws ArgumentError if the specified argument check expressionis false.
checkListIndex throws RangeError if the specified index is out of bounds.
checkState throws StateError if the specified state check expression isfalse.
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 thresholdlength is exceeded.
Multimap is an associative collection that maps keys to collections ofvalues.
BiMap is a bidirectional map and provides an inverse view, allowinglookup 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.
Optional is a way to represent optional values without allowing null.
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hashObjects, hash2, hash3, and hash4 generate high-quality hashCodes fora list of objects, or 2, 3, or 4 arguments respectively.
concat, count, cycle, enumerate, merge, partition, range, andzip create, transform, or combine Iterables in different ways, similar toPython's itertools.
min, max, and extent retrieve the minimum and maximum elements from aniterable.
GeneratingIterable is an easy way to create lazy iterables that produceelements by calling a function. A common use-case is to traverse properties inan object graph, like the parent relationship in a tree.
InfiniteIterable is a base class for Iterables that throws on operations thatrequire a finite length.
getTypeName returns the name of a Type instance.
implements and classImplements determine if an instance or ClassMirror,respectively, implement the interface represented by a Type instance. Theyimplement the behavior of is for mirrors, except for generics.
getMemberMirror searches though a ClassMirror and its class hierarchy fora member. This makes up for the fact that ClassMirror.members doesn'tcontain members from interfaces or superclasses.
Method wraps an InstanceMirror and Symbol to create a callable that invokesa method on the instance. It in effect closurizes a method reflectively.
pattern.dart container utilities for work with Patterns and RegExps.
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 beused as a literal match inside of a RegExp.
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.
Quiver Scoller
loop allows you to loop through characters in a string starting and ending atarbitrary 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'soperator*, but with better character-levelcontrol, 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'
Clock provides points in time relative to the current point in time, forexample: now, 2 days ago, 4 weeks from now, etc. For testability, use Clockrather than other ways of accessing time, like new DateTime(), so that youcan 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, andaWeek are unit duration constants to allow writing for example:
aDayvs.const Duration(days: 1)aSecond * 30vs.const Duration(seconds: 30)
Testing Libraries #
The Quiver testing libraries are intended to be used in testing code, notproduction code. It currently consists of fake implementations of some Quiverinterfaces.
Quiverquant
FakeAsync enables testing of units which depend upon timers and microtasks.It supports fake advancements of time and the microtask queue, which cause faketimers and microtasks to be processed. A Clock is provided from which to readthe current fake time. Faking synchronous or blocking time advancement is alsosupported.
Quiver Definition
areEqualityGroups is a matcher that supports testing operator andhashCode implementations.
Quiver Dating
FakeStopwatch is a Stopwatch that uses a provided now() function to get thecurrent time.
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