Exception Handling

Question 1

What is the $! sign in Ruby?

Answer 1

It is a global constant in which Ruby assigns the last exception.

Question 2

How is the syntax of an exception?

Answer 2

begin
# code to be run
rescue => # there can be more than one rescue
# code to be run if an error occurs in the begin block
retry [Optional] # this will retry until the begin block doesn’t throw an error
else [Optional]
# code to be run if NO error occurs in the begin block
ensure [Optional]
# code to be run either way
end

Question 3

How should be the order when we have several rescue blocks?

Answer 3

Especific exception first and generic ones at the end.