Adding

Adding a binding to a big map is done by calling the function Big_Map.add. If the key was already present in the given big map, the corresponding value is updated.

const my_map: big_map<int,string> =

Big_map.literal([[1,"one"],[2,"two"]]);

const new_map = Big_map.add(3, "three", my_map);

const contains_3 = Big_map.mem(3, new_map); // == true