[erlang-questions] function with no parameter?

[Circular Function]

-export([hej/0,fib/1,fibx/1,fac/1, fac2/1, sq/1,cube/1,power/2, powerc/2,nCk/2]).

hej() -> 12.

this compiles but it doesnt work when calling in the shell.

36> hej(). 
** exception error: undefined function shell_default:hej/0

does this have anything to do with functions should be pure in erlang thus calling a fucntion with no parameter isnt allowed? but then why is creating them allowed?



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