I started using maybe in my codebase. 
I have this kind of code: 
discover_iface_type(Ifname) ->
    maybe
        {ok, Device} ?= validate_input:device(Ifname),
        {ok, DevInfo} ?= ip_addr_dev_info(Device),
       …

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The code demonstrates the usage of the 'maybe' function and alternatives to simplify the code.

Maybe and when