Begin, Rescue and Ensure in Ruby

Small tutorial - overview of Begin, Rescue and Ensure in Ruby with code examples and video
26 September 2017   2772

ensure in Ruby ensures that the code is always evaluated. That's why it's called ensure. So, it is equivalent to Java's and C#'s finally.

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
end

Some blocks form implicit exception blocks. For example, method definitions are implicitly also exception blocks, so instead of writing

def foo
  begin
    # ...
  rescue
    # ...
  end
end

you can write

def foo
  # ...
rescue
  # ...
end

or

def foo
  # ...
ensure
  # ...
end

The same applies to class definitions and module definitions.

Also, this short video tutorial can be userful too.

Ruby\RoR News Digest 3 - 9.08

This week's freshest news, updates and guides from the Ruby and Rails programming
09 August 2019   566

Greetings! I hope your week went great! Here's new Ruby and Ruby on Rails news digest.

As always, we have prepared some great material for you. In this issue, you will learn, for example, how to migrate your Docker\Kubernetes Ruby app today, how to use Ruby unique method to remove duplicates, watch video on how to remove conditionals with Ruby's Array wrap method and many other things.

Guides

  • Don’t change the signature of Sidekiq jobs running in production

Author brings a lot of arguments to the statement, given in the header.

  • Fullstaq Ruby: First impressions, and how to migrate your Docker/Kubernetes Ruby apps today

Short, but interesting tutorial, which covers one of the aspects of Fullstaq Ruby.

  • How to Use The Ruby Uniq Method To Remove Duplicates

 Using uniq with a block provides even more power; great guide for the beginners.

Videos

  • Removing conditionals with Ruby's Array wrap method

  • Dev Quick Tips - Using Ruby's Reduce method to create a Hash of "Banana Bunch" Arrays

Article

  • Tales of the Ruby Grimoire - Part One - The Grimoire

As author of this programming fairytale explains, this is the first of many tales of the legendary Ruby Grimoire, a great and terrible book of Ruby dark magics

  • Introducing the ‘aws-rails-provisioner’ gem developer preview

This gem is designed to help you define and deploy containerized Rails apps on AWS Fargate

Updates

  • Jekyll 4.0.0.pre.beta1 Released 

Pre beta1 of new major version of the solution, that allows to transform text in static websites and blogs

  • Ciao: An HTTP Monitoring Tool, Built on Rails 

Webapp that checks HTTP endpoints and can send notifications when something bad happens

  • Hightop: A Shortcut for Group Count Queries

Adds a top method to Enumberable so works with both plain old arrays or ActiveRecord.

Podcast

  • RR 424: Documenting Your Code

David Kumira (Screencaster of Drifting Ruby, Panelist on Ruby Rogues), Nate Hopkins (CodeFund) and Andrew Mason (Full stack Ruby on Rails developer) talks why documenting your Ruby (and not only Ruby) code is valuable.