MapBasics<K, V> extension

Utility extension methods for the native Map class.

on

• Map<K, V>

Methods

get(K key, {V? defaultValue}) → V?

Available on Map<K, V>, provided by the MapBasics extension

A type-checked version of operator [] that additionally supports returning a default value.

invert() → Map<V, K>

Available on Map<K, V>, provided by the MapBasics extension

Returns a new Map where each entry is inverted, with the key becoming the value and the value becoming the key.

whereKey(bool test(K)) → Map<K, V>

Available on Map<K, V>, provided by the MapBasics extension

Returns a new Map containing all the entries of this for which the key satisfies test.

whereValue(bool test(V)) → Map<K, V>

Available on Map<K, V>, provided by the MapBasics extension

Returns a new Map containing all the entries of this for which the value satisfies test.