Exceptional v2.1.3 Exceptional.Control View Source
Exception control flow
Convenience uses
Everything:
use Exceptional.ControlLink to this section Summary
Link to this section Functions
Link to this macro
branch(maybe_exception, list) View Source (macro)
Branch on if the value is an Exception, applying the associated function for
that case. Does not catch thrown exceptions.
Examples
iex> use Exceptional.Control
...> branch 1,
...> value_do: fn v -> v + 1 end.(),
...> exception_do: fn ex -> ex end.()
2
iex> use Exceptional.Control
...> branch ArgumentError.exception("error message"),
...> value_do: fn v -> v end.(),
...> exception_do: fn %{message: msg} -> msg end.()
"error message"
iex> use Exceptional.Control
...> branch Enum.fetch!([], 99),
...> value_do: fn v -> v + 1 end.(),
...> exception_do: fn ex -> ex end.()
** (Enum.OutOfBoundsError) out of bounds error
Link to this macro
if_exception(maybe_exception, list) View Source (macro)
Alias for Exceptional.Control.branch
Examples
iex> use Exceptional.Control
...> if_exception 1, do: fn ex -> ex end.(), else: fn v -> v + 1 end.()
2
iex> use Exceptional.Control
...> if_exception ArgumentError.exception("error message") do
...> fn %{message: msg} -> msg end.()
...> else
...> fn v -> v end.()
...> end
"error message"
iex> use Exceptional.Control
...> ArgumentError.exception("error message")
...> |> if_exception do
...> fn %{message: msg} -> msg end.()
...> else
...> fn v -> v end.()
...> end
"error message"