Programming Elixir 1.3

Raising an Exception

You can raise an exception using the raise function. At its simplest, you pass it a string and it generates an exception of type RuntimeError.

iex> raise "Giving up"
** (RuntimeError) Giving up
    erl_eval.erl:572: :erl_eval.do_apply/6

You can also pass the type of the exception, along with other optional fields. All exceptions implement at least the message field.

iex> raise RuntimeError
** (RuntimeError) runtime error
    erl_eval.erl:572: :erl_eval.do_apply/6
iex> raise RuntimeError, message: "override message"
** (RuntimeError) override message
    erl_eval.erl:572: :erl_eval.do_apply/6

You can intercept exceptions using the try function. It takes a block of code to execute, and optional ...