Download PDF by Jeremy McAnally: Ruby in Practice

By Jeremy McAnally

ISBN-10: 1933988479

ISBN-13: 9781933988474

The publication learn like a standard Cookbook type reference. the matter i discovered with the e-book is that it lacks sufficient recipes to split it from the Dave Thomas Programming Ruby and Agile improvement with Rails, either introductory programming books. moreover, i locate that screencast and internet sites do a greater activity at instructing a number of of the tutorials which are present in this handbook.

when you are more moderen to Ruby and wish to discover a few stable makes use of of the language than this e-book can aspect you in that course.

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Perhaps you need to trace the sales performance of a range of products across all of your sales locations. Can we keep it simple? First, we’ll need to install three libraries: Active Record (an object-relational mapper for databases), Scruffy (a graphing solution for Ruby), and RMagick (ImageMagick bindings for Ruby, required by Scruffy). Let’s do that using the RubyGems utility: gem install active_record gem install rmagick gem install scruffy Assuming you have all the system prerequisites for these packages (for example, ImageMagick for RMagick to bind to), you should now have all you need.

A test at its core is a piece of code that ensures that another piece of code does what it’s supposed to. In testing, you’re seeking to set up a test state in your application and check for (the right) changes to that state after the tests run. You write tests that will verify the results of a method or other value-bearing code to ensure that, in most cases, the input is handled properly. If you wanted to write tests for your method get_results_as_string, you would write a test to ensure it returned a string.

Why is functional programming so important? For one, it helps you write shorter and more concise code, and some things are easier to express in functional style. For another, the functional style leads to code that doesn’t depend on state and has fewer side effects. Code like that is much easier to mold and refactor, and it gives you more opportunities for reuse. It also makes it easier to build applications that scale. The easiest way to build software that scales is using the “shared nothing” architecture.

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Ruby in Practice by Jeremy McAnally

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