Let’s check out the type safe implementations for two of the Dart’s collection literals: Set & Map.

Set

In a Set collection, each object can only occur once.

Creating Set

A set theSet of the String data type is constructed using the parameterized constructor Set<String>.from({"1"}).

Set<String> theSet = Set<String>.from({"1"});

Same data type item

Two more items of the same type String are added to the set theSet, iterating over the set theSet ...