Download Ruby by Example: Concepts and Code by Kevin C. Baird PDF

By Kevin C. Baird

There could be no higher solution to methods to software than via dissecting actual, consultant examples written on your language of selection. Ruby through Example analyzes a chain of Ruby scripts, analyzing how the code works, explaining the recommendations it illustrates, and exhibiting the right way to regulate it to fit your wishes. Baird's examples exhibit key gains of the language (such as inheritance, encapsulation, higher-order services, and recursion), whereas concurrently fixing tough difficulties (such as validating XML, making a bilingual application, and growing command-line interfaces). every one bankruptcy builds upon the former, and every key proposal is highlighted within the margin to make it more straightforward so that you can navigate the book.

You'll learn the way to:
* Use the interactive Ruby shell (irb) to benefit key gains of the language
* expand Ruby utilizing RubyGems, the Ruby package deal manager
* Create numerical utilities, in addition to utilities that procedure and study HTML/XML
* enforce merely useful and metaprogramming thoughts to save lots of time and effort
* Optimize, profile, and try your code to ensure that it not just does its activity, yet does it well
* Create net functions utilizing Rails

Ruby is the quickest turning out to be programming language this present day, and for sturdy cause: Its dependent syntax and readable code make for prolific and satisfied programmers. however it could be obscure and enforce and not using a little support. Ruby by way of instance indicates you ways to exploit Ruby as you discover Ruby's basic thoughts in action.

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Sample text

We then concatenate information that says that these are bottles of beer, rather than some other liquid, and add the extra argument. Since the argument defaults to the empty string, and concatenating the empty string onto something has no visible effect, we’re safe when there is no argument. NOTE Actually, this is just a ternary operator. It just happens to be the most common one, and therefore, it often gets special naming treatment. It is the only built-in ternary operator in Ruby. , the method defined at , again named with a bang.

What is new is the ability to define completely novel classes of your own, as we do below. /usr/bin/env ruby # 99 bottles problem in Ruby Classes Instance Variables Predicate Methods Destructive Methods 20 C ha pt er 2 class Wall def initialize(num_of_bottles) @bottles = num_of_bottles end =begin rdoc Predicate, ends in a question mark, returns Boolean. zero? () puts sing(' on the wall, ') + sing("\n") + take_one_down! \n\n") end Private Methods private def sing(extra='') "#{(@bottles > 0) ?

We’ve taken care of that at by combining those lines into a String with our old friend the to_s method, and turning it back into an Array with a method called split, which takes a breakpoint argument to break a String into chunks. Let’s see it in action. split('a') => ["", "b", "c", "b"] In our program, we’re breaking on a double line break, which is represented in Ruby, as in many other languages, with \n\n. We now have a variable called quotations, which is an Array, each member of which is a quotation from our external file.

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