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In this guide, we will discuss Erlang is_key. This method is used to determine if a particular key is defined as a key in the map.

Syntax

Is_key(key,map)

Parameters

• key − This is the key which needs to be determined if it is a key in the map.
• map − This is the map in which the key needs to be searched.

Return Value

Returns true if the key is found else false is returned.

For example

-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

The output of the above program is as follows.

true

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