Erlang Programming/Modules

Erlang modules
Each Erlang Programming source file utility.erl

is required to be a separate module. Modules are created with the module statement.

-module(utility). % 1 -export([rotate/1]). % 2                          % 3 rotate([H|T]) ->          % 4 T ++ [H]. % 5

compile with c(utility).

run with utility:rotate([1,2,3]).

and get [2,3,1].

"utility" is the module created by the file utility.erl

utility functions like rotate can be imported elsewhere with: -import(utility).

so now we do not need to use the "utility:" prefix. Importing modules is not generally recommended. This is very similar to python and Java imports.