Ruby in Practice by Jeremy McAnally PDF

By Jeremy McAnally

ISBN-10: 1933988479

ISBN-13: 9781933988474

The ebook learn like a standard Cookbook sort reference. the matter i discovered with the booklet is that it lacks sufficient recipes to split it from the Dave Thomas Programming Ruby and Agile improvement with Rails, either introductory programming books. furthermore, i locate that screencast and internet sites do a greater activity at educating numerous of the tutorials which are present in this guide.

while you're more moderen to Ruby and need to discover a few solid makes use of of the language than this booklet can element you in that course.

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1 Test-driven development is a five-step process: add, fail, code, test, refactor. com> Test-driven development with Ruby 29 In the first step, you add tests for any new code you want to write before you write the code. You write a test that tests for the right behavior of the method; if the method takes a string and returns its length, write a test that calls the method with "hello" and test for a return value of 5; if it should raise an exception when you pass it a nil, test for that. As tests are added, you create a specification of the behavior that your code should conform to.

The way Ruby allows you to extend objects and use constructors relieves you from juggling factories. Iteration is often done with blocks and functions, whereas in nonfunctional languages you tend to use for loops and define anonymous classes. Once you get the hang of all these ideas, you’ll start reframing problems in terms of Ruby, rather than thinking out a solution in a language you’re more familiar with, and writing it in the Ruby syntax. You will often find that reframing problems changes the way you think about code, and you’ll discover new ways to become a better developer.

All these help you reuse code more often. A byproduct of duck typing is that method calls do not check their recipient’s type beforehand. Your code calls a method, and if it fails, it raises an exception. This concept sounds a little cloudy, so let’s look at a piece of code to explain it. Let’s say we have a method that calls size and returns it in a friendly message. " end Our method calls size on the object without regard for its class, so if you feed it an object that responds to the size method, it will work.

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Ruby in Practice by Jeremy McAnally


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