Collections

Maps

Insert and Lookup

A map literal {key: value, ...} builds a key-value store. Assigning to a missing key inserts it.

Program

Play the program to insert one entry and read another.

maps.dart 
void main() {
  var scores = {'Ada': 9, 'Lin': 12};
  scores['Mia'] = 6;
  print(scores['Lin']);
}
map literal `{'Ada': 9, ...}` is a `Map<String, int>`.
insert `scores['Mia'] = 6` inserts a new entry.
lookup `scores['Lin']` reads a value by key.