Erlang Map is_key Method

Erlang Map

This method is used to determine whether a specific key is defined as a key in the map

Syntax

Is_key(key,map)

Parameter

• key −If this is the key in the map, then this is the key that needs to be determined.

• map −This is the map in which the key needs to be searched.

Return Value

If the key is found, it returns true; otherwise, it returns false.

-module(helloworld).　
-export([start/0]).　
start()　->　
　　　Lst1　= [{"a",1},{"b",2},{"c",3}],　
　　　Map1　= maps:from_list(Lst1),　
　　　io:fwrite("~p~n",[maps:is_key("a",Map1).

Output Result

The output of the above program is as follows.

true

Erlang Map