Intro to Ruby - 14 - Error Handling

error_handling.rb

2/0 # => ZeroDivisionError

# In order to give the user a better error message than "ZeroDivisionError"
# we have to wrap the code using begin & rescue keywords so that Ruby knows
# that we specifically want to do something if an error is encountered

begin
  2/0
rescue
  “You can’t divide by ZERO!”
end

# Result:
# => Can’t divide by ZERO!”

# Catching a specific Error
# You can be specific about the errors you catch, by doing a rescue
# specifically on the error you're looking to catch. This allows
# you to run code that might be specific to the error.
# 
# As a good practice if you're catching errors, is to catch Exception
# so that you have a generic error handling. Don't go crazy and wrap
# EVERYTHING but if you're going to catch a specific type of error, 
# you should also catch Exception so that all other error types get 
# potentially handled as well.

begin
  2/0
rescue ZeroDivisionError => zde
  puts zde.message
rescue Exception => ex
  puts “Some other error occured”
  puts ex.message
end

# Result:
# divided by 0
# => nil