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optional comparer, export equality #20

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optional comparer, export equality #20

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5914d63
optional comparer, export equality
yringler Apr 13, 2021
ce83aac
update
yringler Aug 8, 2023
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2 changes: 1 addition & 1 deletion lib/dart_extensions.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@ export 'package:dart_extensions/src/flutter/container.dart';
export 'package:dart_extensions/src/flutter/gesture_detector.dart';
export 'package:dart_extensions/src/flutter/navigation.dart';
export 'package:dart_extensions/src/flutter/padding.dart';
export 'package:dart_extensions/src/equality.dart';
export 'package:dart_extensions/src/http.dart';
export 'package:dart_extensions/src/int.dart';
export 'package:dart_extensions/src/iterable.dart';
Expand All @@ -32,4 +33,3 @@ export 'package:dart_extensions/src/search_algorithms.dart';
export 'package:dart_extensions/src/sort_algorithms.dart';
export 'package:dart_extensions/src/string_ext.dart';
export 'package:dart_extensions/src/flutter/widgets.dart';

17 changes: 11 additions & 6 deletions lib/src/iterable.dart
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Expand Up @@ -27,7 +27,7 @@ extension CollectionsNullableExtensions<T> on Iterable<T>? {
///Returns `true` if this nullable iterable is either null or empty.
bool get isEmptyOrNull => (this?.isEmpty ?? true);

/// Returns `true` if at least one element matches the given [predicate].
/// Returns `true` if at least one element matches the given [predicate].
bool any(bool predicate(T element)) {
if (this.isEmptyOrNull) return false;
for (final element in this.orEmpty()) if (predicate(element)) return true;
Expand All @@ -52,7 +52,9 @@ extension CollectionsNullableExtensions<T> on Iterable<T>? {
/// the combination of them two.
zip<T>(Iterable<T> iterable) sync* {
if (iterable.isEmptyOrNull) return;
final iterables = List<Iterable>.empty()..add(this.orEmpty())..add(iterable);
final iterables = List<Iterable>.empty()
..add(this.orEmpty())
..add(iterable);

final iterators = iterables.map((e) => e.iterator).toList(growable: false);
while (iterators.every((e) => e.moveNext())) {
Expand All @@ -65,9 +67,10 @@ extension CollectionsExtensions<T> on Iterable<T> {
///Sorts elements in the array in-place according to natural sort order of the value returned by specified [selector] function.
Iterable<T> sortBy<TKey>(
TKey Function(T) keySelector, {
required EqualityComparer<TKey> keyComparer,
EqualityComparer<TKey>? keyComparer,
}) {
return InternalOrderedIterable(this, keySelector, keyComparer, false);
return InternalOrderedIterable(
this, keySelector, keyComparer ?? EqualityComparer<TKey>(), false);
}

/// Convert iterable to set
Expand Down Expand Up @@ -205,7 +208,8 @@ extension CollectionsExtensions<T> on Iterable<T> {
T firstOrDefault(T defaultValue) => firstOrNull ?? defaultValue;

/// Will retrun new [Iterable] with all elements that satisfy the predicate [predicate],
Iterable<T> whereIndexed(IndexedPredicate<T> predicate) => _IndexedWhereIterable(this, predicate);
Iterable<T> whereIndexed(IndexedPredicate<T> predicate) =>
_IndexedWhereIterable(this, predicate);

///
/// Performs the given action on each element on iterable, providing sequential index with the element.
Expand Down Expand Up @@ -365,7 +369,8 @@ extension CollectionsExtensions<T> on Iterable<T> {
Iterable<List<T>> chunks(int size) => partition(this, size);

/// Creates a Map instance in which the keys and values are computed from the iterable.
Map<dynamic, dynamic> associate(key(element), value(element)) => Map.fromIterable(this, key: key, value: value);
Map<dynamic, dynamic> associate(key(element), value(element)) =>
Map.fromIterable(this, key: key, value: value);

/// Returns the first element matching the given [predicate], or `null`
/// if element was not found.
Expand Down