19 lines
799 B
Dart
19 lines
799 B
Dart
import 'package:collection/collection.dart';
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extension ExtraMapNullableKey<K extends Object, V> on Map<K?, V> {
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Map<K, V> whereNotNullKey() => <K, V>{for (var v in keys.whereNotNull()) v: this[v] as V};
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}
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extension ExtraMapNullableValue<K extends Object, V> on Map<K, V?> {
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Map<K, V> whereNotNullValue() => <K, V>{for (var kv in entries.where((kv) => kv.value != null)) kv.key: kv.value as V};
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}
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extension ExtraMapNullableKeyValue<K extends Object, V> on Map<K?, V?> {
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Map<K, V?> whereNotNullKey() => <K, V?>{for (var v in keys.whereNotNull()) v: this[v]};
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Map<K?, V> whereNotNullValue() => <K?, V>{for (var kv in entries.where((kv) => kv.value != null)) kv.key: kv.value as V};
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}
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extension ExtraNumIterable on Iterable<int?> {
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int get sum => fold(0, (prev, v) => prev + (v ?? 0));
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}
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