Programming Ruby 1.9: The Pragmatic Programmers' Guide by Dave Thomas, Chad Fowler, Andy Hunt

By Dave Thomas, Chad Fowler, Andy Hunt

Would you're keen on to head from first notion to operating code a lot, a lot speedier? Do you presently spend extra time pleasing the compiler rather than your consumers or finish clients? Are you pissed off with difficult languages that appear to get on your approach, rather than getting the paintings performed? Are you utilizing Rails, and need to dig deeper into the underlying Ruby language? if that is so, then we've acquired a language and booklet for you!

Ruby 1.9 is the most recent model of Ruby. It has many compelling gains, together with multinationalization aid, new block scoping, and higher functionality. while, the present Ruby 1.8 continues to be being maintained and is accepted. We're for this reason liberating either the Ruby 1.9 model of the PickAxe (this ebook) along the 1.8 model of the PickAxe. Readers can pick out the e-book that fits their environment.

Ruby is an absolutely object-oriented language, very similar to the vintage object-oriented language, Smalltalk. Like Smalltalk, it truly is dynamically typed (as against Java or C++), yet in contrast to Smalltalk, Ruby gains a similar conveniences present in glossy scripting languages, making Ruby a favourite instrument of clever, forward-thinking programmers and the root for the Rails internet framework.

this can be the reference handbook for Ruby, together with an outline of all of the typical library modules, an entire connection with all integrated sessions and modules (including the entire new and altered tools brought by means of Ruby 1.9). it is usually the entire new and adjusted syntax and semantics brought due to the fact Ruby 1.8. find out about the recent parameter passing ideas, neighborhood variable scoping in blocks, fibers, multinationalization, and the recent block announcement syntax, between different fascinating new features.

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Extra resources for Programming Ruby 1.9: The Pragmatic Programmers' Guide (Facets of Ruby)

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Your initialize method sets up an environment for your object, leaving it in a usable state. Other methods then use that state. So, let’s turn this from a code fragment into a working program. We’re going to organize our source into three files. rb, will contain the definition of the class BookInStock. rb, is the source for the CsvReader class. rb, is the main driver program. rb file. rb. Ruby has a couple of helper methods that let us load external files. In this file, we use require to load in the Ruby CSV library and require_relative to load in the book_in_stock file we wrote.

The most common of these is \n, which is replaced with a newline character. 0 printing, November 2010) 35 S OME BASIC RUBY produces: And good night, Grandma The second thing that Ruby does with double-quoted strings is expression interpolation. Within the string, the sequence #{expression} is replaced by the value of expression. We could use this to rewrite our previous method: def say_goodnight(name) result = "Good night, #{name}" return result end puts say_goodnight('Pa') produces: Good night, Pa When Ruby constructs this string object, it looks at the current value of name and substitutes it into the string.

4 Symbols Often, when programming, you need to create a name for something significant. For example, you might want to refer to the compass points by name, so you’d write this: NORTH EAST SOUTH WEST = = = = 1 2 3 4 Then, in the rest of your code, you could use the constants instead of the numbers: walk(NORTH) look(EAST) Most of the time, the actual numeric values of these constants are irrelevant (as long as they are unique). All you want to do is differentiate the four directions. Ruby offers a cleaner alternative.

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