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GenServer in Elixir
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=== Callbacks === When defining a GenServer, several callbacks need to be implemented: * **`init/1`**: Initializes the server state and returns it. * **`handle_call/3`**: Handles synchronous messages, also known as "calls", received by the server. * **`handle_cast/2`**: Handles asynchronous messages, also known as "casts", received by the server. * **`handle_info/2`**: Handles non-call or non-cast messages received by the server. * **`terminate/2`**: Cleans up the server state before it terminates.
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