ruby programming language book

* 3 + 3, self. monthly_orders_count_by_province (m, province ))EndEnd Path = "tmp/phone_recharge.xls"Book. write pathPathEnd 17. inject ({})Copy codeThe Code is as follows:Selected_conditions = base_conditions.inject ({}) do | hash, data |Hash [data. first] = data. last unless data. last. blank?HashEnd 18. time_str.instance_of? Copy codeThe Code is as follows:Return time_str if time_str.instance_of? Time 19. Person. instance_eval Copy codeThe Code is

variable like a temporary array, there is a way to not define a temporary variable individually: Copy Code code as follows: (Z | | = []) Of course this is not a good programming habit, it is recommended not to use a lot of code. 8. Use a non-string or non-symbol object as a hash key Maybe you've never tried using a non-string or a symbol object as a hash key, but it's OK and sometimes useful. Copy Code code as follow

How to Learn a programming language and a programming language Select a language Determine the fields you are interested in You can start learning any programming language (although som

This article mainly introduces Ruby's 25 programming details (tips, practical code snippet), this article directly gives the topic and the corresponding code, needs the friend may refer to under 1.try never throws an exception to return nil when not The code is as follows: province_id = Province.find_by_name (Prov). Try (: ID) 2.find (: A: Condotions) method does not speak but with The code is as follows: Mobile_info = Mobileinfo.find (: I,: Con

. There are no spaces (, after or],) before. Some (ARG). Other [1, 2, 3].length ! There are no spaces after that. # bad, something # good !something When and case indentation depth consistent. I know a lot of people disagree with that, but it's the style recognized in "The Ruby programming Language" and "

Working with politics Conclusion Endnotes Installation It seems that the example of this chapter can only look at ... To use politics, you must first has both Memcached and MDNS installed on your system. If you is using Mac OS X, you already has MDNS installed. The same goes for most flavors of UNIX. Memcached'll need to being installed on the most machines. Instructions on what to does this can is found at http://www.danga.com/memcached/. Ins

understand, worth buying ". Think about a group of unknown yards of farmers, in addition to the wedding day firecrackers, a sea of people, a little star-like existence, what achievements can be compared with this? And the editor chatted about the sales of the feedback, I like her conclusion: " believe the reader, the reader's eyes are discerning, do you have the heart they see!" ". And I just want to say: " painstaking people, the days are not negative, there are volunteers, things have become

DriverC language: the C programming language, C and pointer, C traps and defects, and C expert ProgrammingAlgorithm: Introduction to AlgorithmsSoftware Engineering: software testing by Ron Patton and man-month mythEmbedded: full manual for Embedded Linux Application DevelopmentOther reference books and tools: Explanation of TCP/IP, Vim, make, and GDB To learn

HTML, which was originally designed to create dynamic Web pages. The grammar absorbs the C language, Java and Perl features, the entry threshold is lower, easy to learn and widely used. 6.PythonPython is a dynamic language that is used to design a wide variety of applications and is often easier to write than Tcl,perl,ruby,scheme and Java. The Python syntax is c

Tags: array rar organization Throw exception build log job schedule exec expressionThis week's book is the Ultimate guide to Oracle's C PL (SQL) programming, published by the mechanical industry press, Sun Fingdong, Wang Yu, Guo Xiaohui. Content Introduction: The ultimate guide to Oracle 12c PL/SQL is the most systematic, comprehensive, practical and authoritative

When asked this question today, it was always considered a broader concept, even though I have used these characteristics, but have never known this is called "meta programming" until today when people ask, just epiphany some, and then on the Internet and their own flat practical some metaprogramming make a small sum. The so-called metaprogramming in Ruby is the technique of manipulating

?? Functional programming in Javascript home directory previous chapter Functional programming Foundation chapter III Establishment of functional programming environment introductionIf we are just writing applications for functional programming, do we need to know more about advanced mathematical knowledge-type theory,

In Ruby, everything is an object. More precisely, everything in Ruby is a fully functional object. So, in Ruby, the number 4, the fixed-point number 3.14, and the string "Hi" are all objects. Obviously, they are a bit "special" because you don't have to use the new method to create them. Instead, you use a form such as "literal 4" to create an instance of an obje

working on hardware need to master the assembly. I agree that many people say that the assembly is useless and should now learn a high-level programming language. I also said at the beginning of this article that the current learning assembly is just to be able to read the disassembly code in reverse work, or to write shellcode in the exploit technology, or some experts like to embed the assembly code in t

Ruby calculates the maximum sum of Adjacent Elements in the array. Wei renyan 2010.8.21 I recently studied programming Pearl River and was very interested in the questions raised in the book. So according to the description in the book, I used Ruby to solve the related probl

Most of Ruby's built-in types are similar to other programming languages. Mainly have strings,integers,floats,arrays and so on. However, only the scripting language, such as Ruby,perl, and awk provide support for built-in expression types. Shame: Regular expressions are a powerful text-processing tool, albeit covert. They are very different than simply adding a

To recommend a R language in the quantitative financial aspects of the Good book, is my teacher prepared, and I am very fortunate to participate in the preparation of this book process. The book was officially online in May 2015, and it has been around two years since the end of 2013. As soon as the

Free mini book download: the essence of dynamic functional language According to the author Zhou aimin, the book "The essence of JavaScript language and programming practices" was originally named "the essence of dynamic functional lang