where method Null safety

Iterable<MapEntry<K, V>> where(
  1. EntryPredicate<K, V> test
)

Returns a new lazy Iterable with all entries that satisfy the predicate test, providing sequential index of the element.

Implementation

Iterable<MapEntry<K, V>> where(EntryPredicate<K, V> test) =>
    this?.entries.where((e) => test(e.key, e.value)) ?? Iterable.empty();