Ruby Exceptions

ruby_exceptions_1.rb

## http://ruby-doc.org/core-2.3.0/Exception.html

begin
  p '1'
  1 / 0
rescue
  p '2'
end

# "1"
# "2"

begin
  raise 'An exception'
rescue Exception => e
  p e.message
  p e.backtrace
ensure
  p "Finally"
end

# "An exception"

#`irb_binding'
# ["(irb):2:in `irb_binding'", ..., "/Users/michael/.rvm/rubies/ruby-2.0.0-p247/bin/irb:12:in `<main>'"]
#Finally

ruby_exceptions_2.rb

begin
  raise Exception.new 'New Exception' if rand > 0.5
rescue Exception => e
  puts e.message
else
  p "Everything is ok"
ensure
  p "Finally"
end

# "Everything is ok" or "New Exception"
# "Finally"

ruby_exceptions_3.rb

class MyException < Exception; end
  
begin
  raise Exception.new 'My Exception'
rescue MyException => e
  p 'Rescued My Exception'
rescue Exception => e
  p 'Rescued Exception'
end
# "Rescued Exception"