dartbag

A grab-bag of miscellaneous, lightweight utility code for Dart. Functionality includes (but is not limited to):

byte_data

List<int>.asUint8List converts a List<int> to a Uint8List without copying, if possible.

flattenDeep recursively flattens nested Iterables into a single Iterable sequence.
List.reverse reverses a List in place. rain
List.rotateLeft rotates a List in place.
List.sortWithKey sorts a List by computing and caching sort keys, which can be significantly faster if comparisons are expensive.
List.sortWithAsyncKey is a version of sortWithKey that allows the sort key to be computed asynchronously.
Iterable.startsWith returns whether one Iterable starts with the same sequence of elements as another Iterable.
Iterable.padLeft and Iterable.padRight add elements to an Iterable to have a specified length.
zipLongest is a version of zip that stops only after the longest Iterable is exhausted instead of the shortest.
LinkedHashMap.sort.
mergeMapss combines an Iterable of Maps into a single Map.
Map<K, Future<V>>.wait waits for Future values in a Map (in parallel if possible).

clamp clamps a Comparable object to be within a specified range.
compareIterables compares two Iterables in a manner similar to string comparison.
ComparableWrapper wraps a value in a Comparable interface with a specified comparison function.

assertsEnabled returns whether assert is enabled.
currentDartFilePath returns the path to the current .dart file for Dart VM builds.
staticType returns the static type of an object.
String.escape escapes a String such that it can be used as a string literal in generated code.

toStringMatches verifies that a tested value has a matching type and string representation.

lcm computes the least-common-multiple of two integers.
int.floorToMultipleOf, int.ceilToMultipleOf, and int.roundToMultipleOf provide different ways of rounding a non-negative integer to the nearest multiple of another.
Rectangle.center returns the center of a Rectangle.

tryAs casts an object and returns null on failure instead of throwing a TypeError.
chainIf allows conditional method chaining based on a condition.
OutputParameter allows specifying output parameters from functions as a crude mechanism to return multiple values.
int.padLeft converts an int to a String, left-padded with zeroes to have a minimum number of digits.
String.lazySplit is a version of String.split that returns an Iterable to tokenize a String lazily.
String.partialSplit is a version of String.split that limits the number of returned items.
String.substringLoose is a version of String.substring with less strict bounds.
Uri.updateQueryParameters adds or replaces query parameters in a Uri.
bool.implies returns whether one bool logically implies another.
Future.cast casts a Future<T> to a Future<R>.
PollableFuture is an implementation of Future that allows synchronously retrieving the value if it has already been completed.
hoursOnly, minutesOnly, secondsOnly, millisecondsOnly, and microsecondsOnly retrieve specific components of a Duration.
DateTime.toStringWithOffset and DateTime.toIso8601StringWithOffset are versions of DateTime.toString and DateTime.totoIso8601String that include timezone offsets.

tryParseBool parses a bool from a String?.
tryParseInt and tryParseDouble are wrappers around int.tryParse and double.tryParse that accept null arguments.
List<Enum>.tryParse parses an Enum value from a String?.
tryParseDuration parses a Duration from a String?.

randMaxInt portably returns the maximum value allowed by Random.nextInt.
Random.nextIntFrom returns a random integer in a specified range.
lazyShuffler shuffles a List lazily.
RepeatableRandom wraps an existing pseudo-random number generator to allow a random sequence to be easily restarted and to allow the seed to be retrieved.

readableDuration returns a Duration as a human-readable string.
readableNumber returns a number as a human-readable string with SI prefixes and units.

ExpiringPeriodicTimer is a periodic Timer that automatically stops after a time limit.

getTerminalSize attempts to get the number of columns and lines of a terminal.
wordWrap wraps a string to a maximum line length.
ArgResults.parseOptionValue reduces some boilerplate when parsing option values from package:args.