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Iterate with index

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This commit is contained in:
Ming Ming 2021-04-26 18:54:57 +08:00
parent 60353bc489
commit 01e014b72c
2 changed files with 14 additions and 0 deletions
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4
lib/iterable_extension.dart
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@ -1,3 +1,5 @@
import 'package:tuple/tuple.dart';
extension IterableExtension<T> on Iterable<T> { extension IterableExtension<T> on Iterable<T> {
/// Return a new sorted list /// Return a new sorted list
List<T> sorted([int compare(T a, T b)]) => this.toList()..sort(compare); List<T> sorted([int compare(T a, T b)]) => this.toList()..sort(compare);
@ -13,6 +15,8 @@ extension IterableExtension<T> on Iterable<T> {
} }
} }
Iterable<Tuple2<int, T>> withIndex() => mapWithIndex((i, e) => Tuple2(i, e));
/// Whether the collection contains an element equal to [element] using the /// Whether the collection contains an element equal to [element] using the
/// equality function [equalFn] /// equality function [equalFn]
bool containsIf(T element, bool Function(T a, T b) equalFn) => bool containsIf(T element, bool Function(T a, T b) equalFn) =>

10
test/iterable_extension_test.dart
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@ -20,6 +20,16 @@ void main() {
expect(result[4], Tuple2(4, 3)); expect(result[4], Tuple2(4, 3));
}); });
test("withIndex", () {
final src = [1, 4, 5, 2, 3];
final result = src.withIndex().toList();
expect(result[0], Tuple2(0, 1));
expect(result[1], Tuple2(1, 4));
expect(result[2], Tuple2(2, 5));
expect(result[3], Tuple2(3, 2));
expect(result[4], Tuple2(4, 3));
});
test("containsIf", () { test("containsIf", () {
final src = [ final src = [
_ContainsIfTest(1), _ContainsIfTest(1),