kt_dart 0.7.0-dev.3

This project is a port of kotlin-stdlib for Dart/Flutter projects. It includes collections (KtList, KtMap, KtSet) with 150+ methods as well as other useful packages.

0.7.0-dev.3

• Rename (List|Set|Map).immutable() extension to .toImmutableList() to match Dart SDK naming schema.
• Remove int.rangeTo(X) extension. Please use the dartx as replacement which offers the same extension
• Remove T.to(X) extension to create a KtPair. It's too general and should be offered by the dart SDK not a 3rd party package

0.7.0-dev.2

New .dart extensions to convert KtDart collections back to dart collections.

  // New: Converting dart collections to KtDart collections (mutable views)
  final KtMutableList<String> ktList = ["hey"].kt;
  final KtMutableSet<String> ktSet = {"hey"}.kt;
  final KtMutableMap<String, int> ktMap = {"hey": 1}.kt;

  // Converting KtDart collections to dart collections
  final List<String> dartList = KtList.of("hey").dart;
  final Set<String> dartSet = KtSet.of("hey").dart;
  final Map<String, int> dartMap = KtMap.from({"hey": 1}).dart;

0.7.0-dev.1

KtDart makes full use of darts static extension methods, introduced with Dart 2.6.

The public API stays unchanged and is backwards compatible.

Improved interopt with dart collections

It is now easier then ever to convert dart to ktdart collections and vice versa. Use the .kt property to convert dart collections to KtDart collections. (Note: .kt create a view, which allows you to mutate the original dart collection).

  // New: Make dart collections immutable
  final KtList<String> list = ["hey"].immutable();
  final KtSet<String> set = {"hey"}.immutable();
  final KtMap<String, int> map = {"hey": 1}.immutable();

  // New: Converting dart collections to KtDart collections (mutable views)
  final KtMutableList<String> ktList = ["hey"].kt;
  final KtMutableSet<String> ktSet = {"hey"}.kt;
  final KtMutableMap<String, int> ktMap = {"hey": 1}.kt;

  // Converting KtDart collections to dart collections
  final List<String> dartList = KtList.of("hey").asList();
  final Set<String> dartSet = KtSet.of("hey").asSet();
  final Map<String, int> dartMap = KtMap.from({"hey": 1}).asMap();

Tuple improvements

KtPairs can now created with the T0.to(T1) extension.

final KtPair<String, int> pair = "foo".to(42);

Also, KtPair and KtTriple now have a new toList() function to convert the values to a KtList.

New Extensions

• KtList?.orEmpty() returns an empty list when the list is null
• KtSet?.orEmpty() returns an empty set when the set is null
• KtMap?.orEmpty() returns an empty map when the map is null
• KtMap.ifEmpty(() -> defaultValue) returns the default value when the map is empty
• KtIterable<KtIterable<T>>.flatten() flattens the nested collections to KtIterable<T>
• KtIterable<KtPair<T, U>>.unzip(): KtPair<KtList<T>, KtList<U>> unzips list of pairs to list of their first and second values
• KtIterable<Comparable<T>>.min() returns the smallest element of any comparable iterable
• KtIterable<Comparable<T>>.max() returns the largest element of any comparable iterable

0.6.2

diff v0.6.1...v0.6.2

• #96 Dart 2.0.0 comparability. (Was only Dart 2.1.0 compatible).
• #97 Fix broken links to lib classes in documentation
• #97 Adjust analyzer rules. Add new ones and explain why others aren't active. Adjusted the code accordingly

0.6.1

diff v0.6.0...v0.6.1

• #92 Improve pub score by changing comments to ///

0.6.0

diff v0.5.0...v0.6.0

This major update of kt.dart add 10+ extension methods for KtMap and makes working with maps even easier.

Behavior Changes

The properties KtList.list: List,KtSet.set: Set are now deprecated and KtMap.map: Map was removed. Those properties where used to convert kt.dart collections to dart collections. Instead use the new KtList.asList(): List, KtSet.asSet(): Set, KtMa.asMap(): Map methods. The old properties returned copies of the collections. The new as-methods return views of the original collections and reflect changes of the original data.

This breaking change was necessary because the property KtMap.map: Map<K, V> was conflicting with KtMap.map(MapEntry<K, V> -> R) : KtList<R> to map the entries to items of a KtList. Read about further details here.

If you have used properties to iterate over the collections using a for-loop you should now always use iter which is available for all kt.dart collections.

for (final element in listOf("a", "b", "c").iter) {
  print(element); 
}
for (final element in setOf("a", "b", "c").iter) {
  print(element); 
}
for (final p in mapFrom({1: "Bulbasaur", 2: "Ivysaur"}).iter) {
  print("${p.key} -> ${p.value}"); 
}

Additions

• #86 New: KtMap.map Returns a list containing the results of applying the given transform function to each entry in the original map.
• #86 New: KtMap.iter Access to a Iterable to be used in for-loops
• #87 New: KtMap.count Returns the number of entries matching the given [predicate] or the number of entries when predicate = null.
• #89 New: KtMap.minBy Returns the first entry yielding the smallest value of the given function or null if there are no entries.
• #89 New: KtMap.minWith Returns the first entry having the smallest value according to the provided comparator or null if there are no entries.
• #89 New: KtMap.maxBy Returns the first entry yielding the largest value of the given function or null if there are no entries.
• #89 New: KtMap.maxWith Returns the first entry having the largest value according to the provided comparator or null if there are no entries.
• #90 New: KtMap.toList Returns a KtList containing all key-value pairs.
• #78 New: KtMap.forEach Performs given action on each key/value pair from this map. thanks @acherkashyn
• #80 New: KtMap.none Returns true if there is no entries in the map that match the given predicate. thanks @acherkashyn
• #80 New: KtMap.all Returns true if all entries match the given predicate. thanks @acherkashyn
• #80 New: KtMap.any Returns true if there is at least one entry that matches the given predicate. thanks @acherkashyn
• #84 New: KtMap.filterKeys Returns a map containing all key-value pairs with keys matching the given predicate.
• #84 New: KtMap.filterValues Returns a map containing all key-value pairs with values matching the given predicate.
• #79 New: KtMap.asMap Returns a read-only dart:core Map
• #79 New: KtMutableMap.asMap Creates a Map instance that wraps the original KtMap. It acts as a view.

---

• #75 New: KtIterable.takeWhile Returns a list containing first elements satisfying the given predicate.
• #76 New: KtIterable.takeLastWhile Returns a list containing last elements satisfying the given predicate.

---

• #73 New: KtList.takeLast, Returns a list containing last n elements.
• #79 New: KtList.asList Returns a read-only dart:core List
• #79 New: KtMutableList.asList Creates a List instance that wraps the original KtList. It acts as a view.

---

• #79, #91 New: KtSet.asSet Returns a read-only dart:core Set
• #79 New: KtMutableSet.asSet Creates a Set instance that wraps the original KtSet. It acts as a view.

Bugfixes

• #74 Fix: KtList.dropLastWhile was off by 1
• #88 Fix: KtIterable.minWith returned the max value

Documentation

• #68 Document KtSet constructors
• #70 Fix README typos, thanks @RedBrogdon

Misc.

• #69 KtMutableListIterator throws IndexOutOfBoundsException when calling set before next was called
• #81 Force dartfmt on CI
• #83 Improve .gitignore

0.5.0

diff v0.4.2...v0.5.0

Project has been renamed to kt.dart. If you're using a previous version upgrade like this:

pubspec.yaml

dependencies:
-  dart_kollection: ^0.3.0
-  kotlin_dart: ^0.4.0
+  kt_dart: ^0.5.0

your_source.dart

- import 'package:dart_kollection/dart_kollection.dart';
- import 'package:kotlin_dart/kotlin.dart';
+ import 'package:kt_dart/kt.dart';

• #66 Rename KPair -> KtPair and KTriple -> KtTriple
• #67 Rename package kotlin_dart -> kt_dart

0.4.3

diff v0.4.2...v0.4.3

Deprecate package kotlin_dart and recommend users to migrate to kt_dart.

0.4.2

diff v0.4.1...v0.4.2

Shorten pub project description to make pana happy.

0.4.1

diff v0.4.0...v0.4.1

Improve Readme which renders correctly on pub.

0.4.0

diff v0.3.0...v0.4.0

The kollection project was migrated to kotlin.dart where kollection becomes the collection module.

Upgrade

pubspec.yaml

dependencies:
-  dart_kollection: ^0.3.0
+  kotlin_dart: ^0.4.0

your_source.dart

- import 'package:dart_kollection/dart_kollection.dart';
+ import 'package:kotlin_dart/kotlin.dart';

Breaking Changes

• #64 The class prefix of all collections has been changed from K to Kt (KList -> KtList)
• #60 listOf now accepts up to 10 non-null arguments instead of an Iterable. Use listFrom to create KtLists from an dart Iterables
• #60 Collections can now be created with factory constructors i.e. KtList.of(1, 2 ,3). Both APIs, factory constructor and function based one, are equally supported. It only depends on your personal taste.

Here is a list of all collection creation APIs.

Kotlin like, function based syntax

  /// List
  // Create immutable lists
  emptyList<int>();
  listOf(1, 2, 3, 4, 5);
  listFrom([1, 2, 3, 4, 5]);
  // Create mutable lists
  mutableListOf(1, 2, 3, 4, 5);
  mutableListFrom([1, 2, 3, 4, 5]);
  
  /// Set
  // Create immutable sets
  emptySet<int>();
  setOf(1, 2, 3, 4, 5);
  setFrom([1, 2, 3, 4, 5]);
  // Create a mutable set which keeps the order of the items
  linkedSetOf(1, 2, 3, 4, 5);
  linkedSetFrom([1, 2, 3, 4, 5]);
  // Create mutable, unordered hash-table based set
  hashSetOf(1, 2, 3, 4, 5);
  hashSetFrom([1, 2, 3, 4, 5]);
  
  /// Map
  // Create immutable maps
  emptyMap<int, String>();
  mapFrom({1: "a", 2: "b"});
  // Create mutable maps
  mutableMapFrom({1: "a", 2: "b"});
  // Create mutable maps without specified order when iterating over items
  hashMapFrom({1: "a", 2: "b"});
  // Create mutable maps which keep the order of the items
  linkedMapFrom({1: "a", 2: "b"});

Dart like, constructor based syntax

  /// List
  // Create immutable lists
  KList<int>.empty();
  KList.of(1, 2, 3, 4, 5);
  KList.from([1, 2, 3, 4, 5]);
  // Create mutable lists
  KMutableList<int>.empty();
  KMutableList.of(1, 2, 3, 4, 5);
  KMutableList.from([1, 2, 3, 4, 5]);
  
  /// Set
  // Create immutable sets
  KSet<int>.empty();
  KSet.of(1, 2, 3, 4, 5);
  KSet.from([1, 2, 3, 4, 5]);
  // Create a mutable set which keeps the order of the items
  KMutableSet<int>.empty();
  KMutableSet.of(1, 2, 3, 4, 5);
  KMutableSet.from([1, 2, 3, 4, 5]);
  // Create mutable, unordered hash-table based set
  KHashSet<int>.empty();
  KHashSet.of(1, 2, 3, 4, 5);
  KHashSet.from([1, 2, 3, 4, 5]);
  // Create a mutable set which keeps the order of the items
  KLinkedSet<int>.empty();
  KLinkedSet.of(1, 2, 3, 4, 5);
  KLinkedSet.from([1, 2, 3, 4, 5]);
  
  /// Map
  // Create mutable maps
  KMutableMap<int, String>.empty();
  KMutableMap.from({1: "a", 2: "b"});
  // Create mutable maps without specified order when iterating over items
  KHashMap<int, String>.empty();
  KHashMap.from({1: "a", 2: "b"});
  // Create mutable maps which keep the order of the items
  KLinkedMap<int, String>.empty();
  KLinkedMap.from({1: "a", 2: "b"});

0.3.2

diff v0.3.1...v0.3.12

Deprecate package dart_kollection in favour of kt_dart

0.3.1

diff v0.3.0...v0.3.1

Deprecate all APIs and advise users to upgrade to kotlin.dart

0.3.0

diff v0.2.0...v0.3.0

Summary

This release of Kollection fully covers the project with unit tests, from 52% to 99% 🎉. By doing that bugs where discovered and fixed.

Because Dart doesn't support non-nullable types yet, this update manually checks all method arguments at runtime. Passing null in any method will throw ArgumentError unless documented otherwise.

Behavior changes

• #36 All method arguments are now validated for nullability. If a argument isn't documented as "nullable" the method will throw ArgumentError (when asserts are enabled)
• #51, #46 KIterable<T>.associateWithTo, Kiterable<T>.filterTo, KIterable<T>.filterIndexedTo, KIterable<T>.filterNotTo, KIterable<T>.filterNotNullTo , KIterable<T>.groupByTo ,KMap<T>.mapKeysTo ,KMap<T>.mapValuesTo, KIterable.toCollection did not compile when called directly due to dart-lang/sdk/issues/35518. The type of destination of those methods has been changed to a dynamic type (i.e. KMutableList<T> -> KMutableList<dynamic>). Those methods will now be checked at runtime. This has one advantage: It allows to pass in contravariant types.

final KIterable<int> iterable = listOf([4, 25, -12, 10]);
final result = mutableListOf<num>(); // covariant!
final filtered = iterable.filterIndexedTo(result, (i, it) => it < 10);
expect(identical(result, filtered), isTrue);
expect(result, listOf([4, -12]));

• #56 KMutableEntry.setValue now throws UnimplementedError because of bug #55. It anyways never worked.
• #58 KSet doesn't allow mutation of its elements with via set getter. It is now really immutable.

API changes

• #38 Breaking: Removed hashMapFrom(KIterable<KPair>) because, unlike Kotlin, it feels unnatural in Dart. Instead use hashMapOf to construct a KMutableMap

• #17 Breaking: KMap.associateBy now takes only a single parameter (K Function(T) keySelector). If you used valueTransform use KMap.associateByTransform as replacement

• #23 New KMutableList.[]= operator. Example: list[4] = "Hello"

• #47 New KMap methods filter, filterTo, filterNot, filterNotTo,

• #37 KCollection.random now optionally accepts a Random as argument which can be seeded

• #39 KMutableList.removeAt now throws IndexOutOfBoundsException when index exceeds length or is negative

• #18 KMutableCollection: addAll, removeAll and retainAll now receive KIterable as parameter, was KCollection

Bug fixes

• #18 Fixed KList.first stackoverflow
• #44 Fixed Klist.single stackoverflow
• #24 Fixed KList.last which returned first
• #20 Fixed KIterable.firstOrNull which threw NoSuchElementException for empty lists, now returns null
• #22 Fixed KIterable.mapIndexedTo, KIterable.mapIndexedNotNullTo couldn't be called due to a generic compilation error
• #26 Fixed KList.containsAll returned false when all elements ar in list
• #28 Fixed KListIterator.nextIndex was off by one, now returns the index of the element which will be returned by next()
• #30 Fixed KMutableList.sortBy and sortByDescending not sorting the KMutableList but a copy
• #31 Fixed KIterable.none always returned true (Was always working for KCollection)
• #51 Fixed KSet.==() returns false for setOf<int>([1, 2, 3]) == setOf<num>([1, 2, 3])

Documentation changes

• #57 Document hashSetOf and linkedSetOf
• #19 KIterable.any document return value when called without predicate
• #51 Document expected type of now dynamically typed KIterable<T>.associateWithTo, Kiterable<T>.filterTo, KIterable<T>.filterIndexedTo, KIterable<T>.filterNotTo, KIterable<T>.filterNotNullTo , KIterable<T>.groupByTo ,KMap<T>.mapKeysTo ,KMap<T>.mapValuesTo, KIterable.toCollection

Other changes

• Added a lot of tests #19, #27, #32, #33, #34, #35, #39, #40, #41, #42, #43, #45, #53, #54, #58,
• #48, #49, #50, #59 Activated many lint checks
• #25 tool/run_coverage_locally.sh now installs deps only when not installed and prints resulting HTML report path

0.2.0

diff v0.1.0...v0.2.0

Behavior change

• #6 Breaking: KMutableIterator.remove now throws UnimplementedError because of bug #5

API changes

• #1 Add Set<T> get set returning the internal dart set
• #1 Add Map<K, V> get map returning the intenral dart set
• #7 Add KMap.toMap and KMap.toMutableMap
• #8 Add KMap.isNotEmpty
• 3e3228e Add KMap.toString()
• #9 Add Map.plus, Map.minus and operator +(KMap<K, V> map), operator -(K key)
• #12 Remove const constructors from collection interfaces
• #13 Remove default implementations from collection interfaces

Documentation changes

• #15 Add documentation for compareBy and compareByDescending

Other changes

• #2 Travis CI #2
• #3, #4 Code coverage
• #10 Test KMutableList.fill
• #11 Test KPair, KTriple
• #14 Test Exceptions
• #15 Test Comparators naturalOrder(), reverseOrder()
• #15 Test reverse(Comparator) util function
• 6dd0d85 Reformatted with dartfmt (80 chars)

0.1.0

Initial release for

• KList/KMutableList
• KSet/KMutableSet
• KMap/KMutableMap

with tons of extensions waiting for you to use them!