By Jay McGavren
Head First Ruby makes use of an enticing, lively method of studying that is going past dry, summary causes and reference manuals. This Head First consultant teaches you the Ruby language in a concrete method that will get your neurons zapping and is helping you develop into a Ruby genius. you will input at Ruby's language fundamentals and paintings via gradually complicated Ruby positive aspects akin to periods, inheritance, and blocks. As your Ruby talents develop, you will take on deep subject matters corresponding to exception dealing with, modules, and mixins. you will finish via writing your personal internet app.
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Extra info for Head First Ruby: A learner's companion to Ruby
New Once we have one or more instances of the class, we can call their instance methods. We do it in the same way we've called all other methods on objects so far: we use the dot operator to specify which instance is the method's reciever. move("food bowl") Bark! Running to the food bowl. info Dog talk move chapter title here Breaking our giant methods up into classes The animal rescue's solution uses strings to track what type of animal they're dealing with. Also, all knowledge of the different ways that different animals should respond is embedded in giant if/else statements.
Let's try loading them up in irb, and take them for a spin. rb". Step Two: Open a system command prompt, and navigate into the directory where you saved your file. info chapter title here (Continued) Step Three: Since we're loading code from a file into irb, we want to be able to load Ruby files from the current directory. So we're going to invoke irb a little differently this time. At the command prompt, type this and press Enter: irb -I . A flag that means "search the current directory for files to load".
A flag that means "search the current directory for files to load". The -I is a command line flag, a string that you add on to a command to change how it operates. In this case, -I alters the set of directories that Ruby searches for files to load. ) represents the current directory. Step Four: Now, irb should be loaded, and we should be able to load the file with our methods. rb files by default, so you can leave the extension off. If you see the result true, it means your file was loaded successfully.