https://aalvrz.me/tags/exercism/ Recent content in exercism on Andrés Álvarez Hugo -- gohugo.io en-us Mon, 12 Jun 2017 00:00:00 +0000 https://aalvrz.me/posts/using-lambdas-in-case-statements-in-ruby/ Mon, 12 Jun 2017 00:00:00 +0000 https://aalvrz.me/posts/using-lambdas-in-case-statements-in-ruby/ <p>In a <a href="http://aalvarez.me/blog/posts/using-objects-and-ranges-with-cases-in-ruby.html">previous post</a> I talked about how we could use Ruby ranges inside case statements. This was a very neat way of using case statements that would make our code more readable and less repetitive.</p> <p>The other day I was trying to solve the <a href="http://exercism.io/submissions/03c3c93f23b8420faff3107e2ad18286">Bob Ruby exercise in Exercism</a>, and I came up with another very cool way to use case statements: with Lambdas.</p> <h2 id="the-problem">The Problem</h2> <p>The Bob problem is very simple. The program receives some input, and it returns some output based on the contents of the input. A strong indication for using a case statement. From the problem's README file:</p> <pre><code>Bob is a lackadaisical teenager. In conversation, his responses are very limited. Bob answers 'Sure.' if you ask him a question. He answers 'Whoa, chill out!' if you yell at him. He says 'Fine. Be that way!' if you address him without actually saying anything. He answers 'Whatever.' to anything else. </code></pre><h2 id="solutions">Solutions</h2> <p>The test provided by Exercism indicates that we should create a <code>Bob</code> class with a <code>hey</code> class method that receives a remark. We could then use a case statement with this remark and evaluate if the remark is a question, yelling, or whatever else needs to be determined according to the instructions. We could create some class methods to determine each of these possibilities:</p>