programming ruby 2nd edition the pragmatic programmer s guide pdf

... argument list appears between vertical bars. In this instance, the variable f receives the value passed to the yield, so the block prints successive members of the series. (This example also shows parallel ... 'drum' => 'percussion', 'oboe' => 'woodwind', 'trumpet' => 'brass', 'violin' => 'string' } Hashes ... 99] Arrays have a large number of other useful methods. Using these, you can treat arrays as stacks, sets, queues, dequeues, and fifos. A complete list of array methods starts on page 282. Hashes Hashes...

Ngày tải lên: 01/06/2014, 12:34

... recommend using parenthe ses in all but the simplest cases. This example also shows some Ruby string objects. You have many ways to create a string object, but probably the most common is to use string ... 0 histogram['key1'] = histogram['key1'] + 1 histogram['key1'] → 1 Array and hash objects have lots of useful methods: see the discussion starting on page 40, an d the reference sections starting ... book is a heavily revised version of the book Programming Ruby, originally published by Addison Wesley. This book is printed with their permission. Our Pragmatic courses, workshops, and other...

Ngày tải lên: 06/03/2014, 17:20

... Pools 9-19 Using Tags in Session Pools 9-19 OCI Handles for Session Pooling 9-19 Using OCI Session Pooling 9-20 OCI Calls for Session Pooling 9-21 Example of OCI Session Pooling 9-23 When to Use ... 15-24 OCIServerAttach() 15-27 OCIServerDetach() 15-30 OCISessionBegin() 15-31 OCISessionEnd() 15-35 OCISessionGet() 15-36 OCISessionPoolCreate() 15-40 OCISessionPoolDestroy() 15-44 OCISessionRelease() ... ensure the safe use of such applications if the Programs are used for such purposes, and Oracle Corporation disclaims liability for any damages caused by such use of the Programs. Oracle is a...

Ngày tải lên: 17/01/2014, 06:20

... that ends a block. 3.2 If-Else The if-else statement is used to express decisions. Formally the syntax is if (expression) statement 1 else statement 2 where the else part is optional. The expression ... popular styles. Pick a style that suits you, then use it consistently. Most of the work gets done in the body of the loop. The Celsius temperature is computed and assigned to the variable celsius ... instead. Since an if tests the numeric value of an expression, certain coding shortcuts are possible. The most obvious is writing if (expression) instead of if (expression != 0) Sometimes...

Ngày tải lên: 16/08/2012, 11:09

Ngày tải lên: 05/10/2012, 09:59

... publishers like O’Reilly Media, Prentice Hall Professional, Addison-Wesley Professional, Microsoft Press, Sams, Que, Peachpit Press, Focal Press, Cisco Press, John Wiley & Sons, Syngress, Morgan ... http://developer.android.com /guide/ developing/ tools/monkey.html. sqlite3 Android uses SQLite as the database system for many system databases and provides APIs for applications to make use of SQLite, which is convenient ... have the prerequisites for the Android SDK, and are ready to install the SDK. The Android SDK is a collection of files: libraries, executables, scripts, documentation, and tools. Installing the SDK...

Ngày tải lên: 21/02/2014, 19:20

... primitives (mutexes, semaphores, mon- itors, and sometimes condition variables), and classical problems like readers- writers and producers-consumers. When I took the Operating Systems class at Berkeley, ... as the number of components increases, the number of interactions grows unmanageably. Nevertheless, I found patterns in the solutions I saw, and discovered at least some systematic approaches ... most of them were able to solve most of the puzzles. In some cases they reinvented classical solutions; in other cases they found creative new approaches. 3.6 Reusable barrier 35 3.6.2 Reusable...

Ngày tải lên: 15/03/2014, 11:20

... classes you can get the additional benefits of indirect software reuse when the class you're using turns around and reuses other classes that it gets some characteristics from. But this is ... length($1)/'; $DB::alias{'stop'} = &apos ;s/ ^stop (at|in)/b/'; $DB::alias{'ps'} = &apos ;s/ ^ps\b/p scalar /'; $DB::alias{'quit'} = &apos ;s/ ^quit\b.*/exit/'; ... And to the minimalists in the crowd, Perl seems like a pointless exercise in redundancy. But that&apos ;s okay. The world needs a few reductionists (mainly as physicists). Reductionists like to...

Ngày tải lên: 25/03/2014, 10:29

... abstract classes, which exist only to be specialized, and a discussion of the root of all classes, the class Object. 5.1 Specialization and Generalization Classes and their instances (objects) do ... treated as if they were instances of more general classes, a process known as polymorphism. This chapter ends with a consideration of sealed classes, which cannot be specialized, as well as abstract ... access modifier.) The identifier is the name of the class that you provide. The optional base-class is discussed in Chapter 5. The member definitions that make up the class-body are enclosed...

Ngày tải lên: 31/03/2014, 17:16

... that sort and sum lines in the standard input stream. Example 2-7. PP2E\System\Streams\sorter.py import sys lines = sys.stdin.readlines( ) # sort stdin input lines, lines.sort( ) # send result ... \PP2E\System>python testargv.py ['testargv.py'] C:\ \PP2E\System>python testargv.py spam eggs cheese ['testargv.py', 'spam', 'eggs', 'cheese'] ... turns out to be a key concept in some scripts' execution: it&apos ;s always the implicit place where files processed by the script are assumed to reside, unless their names have absolute...

Ngày tải lên: 31/03/2014, 17:16

... have successfully installed the book samples. The book samples are all unit tested, with tests located in the e x a m p l e s / t e s t directory. The tests for the samples themselves are not ... erratum ã discuss Forms ã 23 www.it-ebooks.info Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear ... Variables The REPL includes several useful special variables. When you are working in the REPL, the results of evaluating the three most recent expressions are stored in the special variables *1 ,...

Ngày tải lên: 24/04/2014, 16:00

... and unambiguous for users and for the system. One of the most difficult tasks in creating interactive applications is to understand how the system sees messages from users and how the user sees messages ... a secondary task. This is where you begin to see the real complexities of communication between users and systems. The user is commu- nicating with a system and asks the system to perform some ... entities fully commu- nicating because the regulated system doesn’t respond—it simply changes its behavior—but it does involve continuous systems. Systems can perform this task on their own as well,...

Ngày tải lên: 05/05/2014, 16:42

... of this idea, as we discuss in Section 4.7. If celestial objects (such as galaxy clusters, galaxies, radio sources, quasars, etc.) are distributed homogeneously and isotrop- ically on large scales, ... an observer is just l = L 4πr 2 (1.9.1) if one neglects absorption. This is the same as Equation (1.7.1). Let us assume, for simplicity, that all stars have the same absolute luminosity and the ... in such a way that these conditions are the same in each of the regions? One either has to suppose that causal physics is not responsible for this homogeneity, or that the calculation of the...

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Ngày tải lên: 21/06/2014, 03:20

Ngày tải lên: 21/06/2014, 03:20

Ngày tải lên: 21/06/2014, 03:20