Map<
Creates a LinkedHashMap instance that contains all key/value pairs of
other.
The keys must all be instances of K and the values of V.
The other map itself can have any type.
A LinkedHashMap requires the keys to implement compatible
operator== and hashCode, and it allows null as a key.
It iterates in key insertion order.
Implementation
factory Map.from(Map other) = LinkedHashMap<K, V>.from;