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Add flattenedToList and flattenedToSet #328

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20 changes: 20 additions & 0 deletions lib/src/iterable_extensions.dart
Original file line number Diff line number Diff line change
Expand Up @@ -891,6 +891,26 @@ extension IterableIterableExtension<T> on Iterable<Iterable<T>> {
yield* elements;
}
}

/// The sequential elements of each iterable in this iterable.
///
/// Iterates the elements of this iterable.
/// For each one, which is itself an iterable,
/// all the elements of that are added
/// to the returned list, before moving on to the next element.
List<T> get flattenedToList => [
for (final elements in this) ...elements,
];

/// The unique sequential elements of each iterable in this iterable.
///
/// Iterates the elements of this iterable.
/// For each one, which is itself an iterable,
/// all the elements of that are added
/// to the returned set, before moving on to the next element.
Set<T> get flattenedToSet => {
for (final elements in this) ...elements,
};
}

/// Extensions that apply to iterables of [Comparable] elements.
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50 changes: 50 additions & 0 deletions test/extensions_test.dart
Original file line number Diff line number Diff line change
Expand Up @@ -1034,6 +1034,56 @@ void main() {
[1, 2, 3, 4]);
});
});
group('.flattenedToList', () {
var empty = iterable(<int>[]);
test('empty', () {
expect(iterable(<Iterable<int>>[]).flattenedToList, []);
});
test('multiple empty', () {
expect(iterable([empty, empty, empty]).flattenedToList, []);
});
test('single value', () {
expect(
iterable(<Iterable>[
iterable([1])
]).flattenedToList,
[1]);
});
test('multiple', () {
expect(
iterable(<Iterable>[
iterable([1, 2]),
empty,
iterable([3, 4])
]).flattenedToList,
[1, 2, 3, 4]);
});
});
group('.flattenedToSet', () {
var empty = iterable(<int>[]);
test('empty', () {
expect(iterable(<Iterable<int>>[]).flattenedToSet, <int>{});
});
test('multiple empty', () {
expect(iterable([empty, empty, empty]).flattenedToSet, <int>{});
});
test('single value', () {
expect(
iterable(<Iterable>[
iterable([1])
]).flattenedToSet,
{1});
});
test('multiple', () {
expect(
iterable(<Iterable>[
iterable([1, 2]),
empty,
iterable([3, 4])
]).flattenedToSet,
{1, 2, 3, 4});
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});
});
});
group('of comparable', () {
group('.min', () {
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