where method

Map<K, V> where(
  1. bool f(
    1. K key,
    2. V value
    )
)

https://github.com/vandadnp/flutter-tips-and-tricks/blob/main/tipsandtricks/where-clause-on-map-in-dart/where-clause-on-map-in-dart.md

Implementation

Map<K, V> where(bool Function(K key, V value) f) => Map<K, V>.fromEntries(
    entries.where((element) => f(element.key, element.value)));