The general flow of begin/rescue/else/ensure/end
looks like this:
begin
# something which might raise an exception
rescue SomeExceptionClass => some_variable
# code that deals with some exception
rescue SomeOtherException => some_other_variable
# code that deals with some other exception
else
# code that runs only if *no* exception was raised
ensure
# ensure that this code always runs, no matter what
# does not change the final value of the block
end
You can leave out rescue
, ensure
or else
.
Some blocks form implicit exception blocks. For example, method definitions are implicitly also exception blocks, like:
def foo
# ...
rescue
# ...
end