HEAD FIRST RUBY EBOOK

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Editorial Reviews. About the Author. Jay McGavren was doing automation for a hotel services Head First Ruby: A Brain-Friendly Guide 1st Edition, site Edition. by. Read "Head First Ruby A Brain-Friendly Guide" by Jay McGavren available from Rakuten Kobo. Sign up today and get $5 off your first download. What will you. Read "Head First Ruby A Brain-Friendly Guide" by Jay McGavren available from Rakuten Kobo. What will you learn from this book? What's all the buzz about.


Head First Ruby Ebook

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Based on the latest research in cognitive science and learning theory, Head First Ruby uses a visually rich format to engage your mind, rather than a text-heavy. Compre Head First Ruby: A Brain-Friendly Guide (English Edition) de Jay McGavren na acpricgarniecent.ml Confira também os eBooks mais vendidos. This is the official website for Head First Ruby, written by Jay McGavren and published by O'Reilly Media. You'll find sample code from the book here, as well as.

Do you feel like all those extra compilers and libraries and class files and keystrokes in your other language bring you closer to a finished product, admiring coworkers, and happy customers? Would you like a language that takes care of the details for you?

If you sometimes wish you could stop maintaining boilerplate code and get to work on your problem, then Ruby is for you. Ruby lets you get more done with less code. But the only methods you could call, and the only kinds of objects you could create, were the ones that Ruby defined for you.

And the copies are starting to fall out of sync—some are fine, while others have bugs. Fewer copies means fewer maintenance headaches! If you call certain instance methods before adding data, an error will be raised that will bring your whole program to a screeching halt. Lists of addresses.

Lists of phone numbers. Lists of products. Matz, the creator of Ruby, knew this. So he worked really hard to make sure that working with lists in Ruby is really easy.

First, he ensured that arrays, which keep track of lists in Ruby, have lots of powerful methods to do almost anything you might need with a list.

Second, he realized that writing code to loop over a list to do something with each item, although tedious, is something developers were doing a lot.

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So he added blocks to the language, and removed the need for all that looping code. What is a block, exactly?

Read on to find out Chapter 6 Code Samples More Exercises Up until now, you've just seen methods handing data off to a block, and expecting the block to handle everything.

But a block can also return data to the method. This feature lets the method get directions from the block, allowing it to do more of the work.

In both cases, you start at the beginning of the array, and look through Every. What if there were a kind of collection where all the data had labels on it? You could quickly find the elements you needed! You probably had a hard time sorting out the confusion that ensued.

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Well, Ruby objects are just like those contacts in your address book, and calling methods on them is like sending messages to them. So he added blocks to the language, and removed the need for all that looping code. What is a block, exactly? Read on to find out Up until now, you've just seen methods handing data off to a block, and expecting the block to handle everything. But a block can also return data to the method. This feature lets the method get directions from the block, allowing it to do more of the work.

In both cases, you start at the beginning of the array, and look through Every. What if there were a kind of collection where all the data had labels on it?

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You could quickly find the elements you needed! Ever sent an email to the wrong contact?

You probably had a hard time sorting out the confusion that ensued. Well, Ruby objects are just like those contacts in your address book, and calling methods on them is like sending messages to them.

This chapter will help you recognize the signs that this is happening, and help you get your programs running smoothly again. You can only inherit methods from one class. But what if you need to share several sets of behavior across several classes?

Like methods for starting a battery charge cycle and reporting its charge level—you might need those methods on phones, power drills, and electric cars. Are you going to create a single superclass for all of those?

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Or methods for starting and stopping a motor. The Ruby core library includes two mixins that will blow your mind. The first, Comparable , is used for comparing objects. The second mixin, Enumerable , is used for working with collections. Those came from Enumerable.

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And again, you can mix it into your classes. Read on to see how!

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Teach them how to fish, and you feed them for a lifetime. You just have to know where to find it, and how to interpret it. In the real world, the unexpected happens.

Someone could delete the file your program is trying to load, or the server your program is trying to contact could go down. Your code could check for these exceptional situations, but those checks would be mixed in with the code that handles normal operation.

And that would be a big, unreadable mess. Are you sure your software is working right now? Really sure?Chapter 13 Unit Testing: Jay McGavren Edition: Lists of addresses. Jonathan M.

Why waste your time struggling with new concepts? Locations where this product is available This item is not currently in stock in Dymocks stores - contact your local store to order. Lucas Carlson.