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

By Dave Thomas, Chad Fowler

Would you're keen on to head from first proposal to operating code a lot, a lot speedier? Do you presently spend extra time pleasant the compiler rather than your consumers or finish clients? Are you annoyed with hard languages that appear to get on your means, 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 have now a language and e-book for you!

Ruby 1.9 is the most recent model of Ruby. It has many compelling gains, together with multinationalization help, new block scoping, and higher functionality. even as, the present Ruby 1.8 continues to be being maintained and is typical. we are for that reason liberating either the Ruby 1.9 model of the PickAxe (this e-book) along the 1.8 model of the PickAxe. Readers can pick out the booklet that fits their environment.

Ruby is a completely object-oriented language, very like the vintage object-oriented language, Smalltalk. Like Smalltalk, it truly is dynamically typed (as against Java or C++), yet not like Smalltalk, Ruby positive aspects a similar conveniences present in smooth scripting languages, making Ruby a favourite software of clever, forward-thinking programmers and the foundation for the Rails net framework.

This is the reference guide for Ruby, together with an outline of all of the typical library modules, a whole connection with all integrated periods and modules (including the entire new and adjusted equipment brought by way of Ruby 1.9). it is usually all of the new and altered syntax and semantics brought considering Ruby 1.8. know about the recent parameter passing principles, neighborhood variable scoping in blocks, fibers, multinationalization, and the hot block assertion syntax, between different fascinating new features.

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223 223 227 227 228 229 234 237 file erratum ready solely for Ian MacLeod this replica is (3. zero printing, November 2010) 6 CONTENTS sixteen Namespaces, resource records, and Distribution sixteen. 1 Namespaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sixteen. 2 Organizing Your resource . . . . . . . . . . . . . . . . . . . . . . . . . sixteen. three dispensing and fitting Your Code . . . . . . . . . . . . . . . . . . 238 238 239 246 17 personality Encoding 17. 1 Encodings . . . . . . . . . . 17. 2 resource documents . . . . . . . . . 17. three Transcoding . . . . . . . . . 17. four enter and Output Encoding .

Street Map 17 I points of Ruby 19 1 Getting begun 1. 1 The Command recommended . . . . . . . 1. 2 fitting Ruby . . . . . . . . . . . 1. three working Ruby . . . . . . . . . . . 1. four Ruby Documentation: RDoc and ri 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 20 22 27 29 Ruby. new 2. 1 Ruby Is an Object-Oriented Language 2. 2 a few uncomplicated Ruby . . . . . . . . . . . 2. three Arrays and Hashes . . . . . . . . . . 2. four Symbols .

Four, on web page 330. outlined? The outlined? operator returns nil if its argument (which will be an arbitrary expression) isn't really outlined; another way, it returns an outline of that argument. If the argument is yield, outlined? returns the string “yield” if a code block is linked to the present context. outlined? outlined? outlined? outlined? outlined? outlined? outlined? outlined? outlined? 1 dummy printf String $_ Math::PI a = 1 forty two. abs nil # # # # # # # # # => => => => => => => => => "expression" nil "method" "constant" "global-variable" "constant" "assignment" "method" "nil" evaluating items as well as the boolean operators, Ruby items help comparability utilizing the tools ==, ===, <=>, =~, eql?

Even supposing that parameter is out of scope by the point the block is named, the parameter continues to be available to the block. this can be referred to as a closure—variables within the surrounding scope which are referenced in a block stay available for the lifetime of that block and the lifetime of any Proc item produced from that block. 7. There’s really a 3rd, proc, however it is successfully deprecated. document erratum ready solely for Ian MacLeod this reproduction is (3. zero printing, November 2010) eighty two B LOCKS and that i TERATORS Here’s one other example—a technique that returns a Proc item that returns successive powers of two whilst known as: def power_proc_generator worth = 1 lambda { worth += worth } finish power_proc = power_proc_generator places power_proc.

New(2). to_s) assert_equal("iii", Roman. new(3). to_s) assert_equal("iv", Roman. new(4). to_s) assert_equal("ix", Roman. new(9). to_s) finish finish produces: Loaded suite /tmp/prog all started F accomplished in zero. 000658 seconds. 1) Failure: <"ii"> anticipated yet used to be <"i">. 1 assessments, 2 assertions, 1 mess ups, zero blunders, zero skips test_simple(TestRoman) [/tmp/prog. rb:6]: document erratum ready solely for Ian MacLeod this reproduction is (3. zero printing, November 2010) 191 T HE T ESTING F RAMEWORK Uh-oh! the second one statement failed.

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