Map<K, V>.from constructor Null safety

Map<K, V>.from(
  1. Map other
)

Creates a LinkedHashMap with the same keys and values as other.

The keys must all be instances of K and the values of V. The other map itself can have any type, unlike for Map.of, and the key and value types are checked (and can fail) at run-time.

Prefer using Map.of when possible, and only use Map.from to create a new map with more precise types than the original, and when it's known that all the keys and values have those more precise types.

A LinkedHashMap requires the keys to implement compatible operator== and hashCode. It iterates in key insertion order.

Implementation

factory Map.from(Map other) = LinkedHashMap<K, V>.from;