39 lines
1 KiB
Dart
39 lines
1 KiB
Dart
extension ListExtension<E> on List<E> {
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List<List<E>> chunks(int chunkSize) {
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final List<List<E>> result = <List<E>>[];
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for (var i = 0; i < length; i += chunkSize) {
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result.add(
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sublist(i, i + chunkSize > length ? length : i + chunkSize),
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);
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}
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return result;
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}
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// splitMatch, based on the matchFunction, split the input list in two
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// lists. result.matched contains items which matched and result.unmatched
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// contains remaining items.
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ListMatch<E> splitMatch(bool Function(E e) matchFunction) {
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final listMatch = ListMatch<E>();
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for (final element in this) {
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if (matchFunction(element)) {
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listMatch.matched.add(element);
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} else {
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listMatch.unmatched.add(element);
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}
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}
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return listMatch;
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}
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Iterable<E> interleave(E separator) sync* {
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for (int i = 0; i < length; i++) {
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yield this[i];
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if (i < length) yield separator;
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}
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}
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}
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class ListMatch<T> {
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List<T> matched = <T>[];
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List<T> unmatched = <T>[];
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}
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