ruby programming exercises

25 Ruby programming details This article mainly introduces 25 programming details (tips and practical code segments) of Ruby. This article provides the subject and corresponding code. For more information, see 1. try will never throw an exception and return nil if there is no The Code is as follows: Province_id = Provi

processing those queues extremely effective and POWERFU L. What is does this module offer us? The Politics::tokenworker module, when included-a worker class, allows us to create a class that would either process The work we give it and act as the ' leader, ' or patiently sit and wait for their turn to be the ' leader ' while not doing any Work. Code stick here, read it. PAGE137 has an explanation. Token Worker class: Conclusion Endnotes Util Page142

I was surprised that the first study note I wrote last night had a comment, but today I am still unable to improve my basic knowledge. Let's take a look at the three books to understand the general process of program development. Today, I did not know how to wander around and found this website, which is specially used for programming exercises. I can log on with my google account. I simply sorted it out an

This article mainly introduces the simple introduction of socket programming in Ruby, is the basic knowledge of Ruby network programming learning, need friends can refer to the Ruby provides two access-level network services. At a lower level, you can access the underlying

Ruby's 25 programming details (tips and practical code segments), ruby25 1. try will never throw an exception and return nil if there is noCopy codeThe Code is as follows:Province_id = Province. find_by_name (prov). try (: id) 2. The find (: first,: condotions) method does not speakCopy codeThe Code is as follows:Mobile_info = MobileInfo. find (: first,: conditions => ["mobile_num =? ", Mobile_num.to_ I]) 3. find (: all,: select,: conditions)Copy code

Ruby and linux shell are examples of common programming. What if I want ruby if I have shell? This is not the case. It is very convenient to use ruby for some small functions. For example, it is troublesome to use shell for string inversion and 1 function. str = "123456", we define a small method of plus 1 after invers

You may think the following chart is interesting, because it is a quality data filtering algorithm written in three programming languages (Ruby, Java, C/C ++: sieve of Eratosthenes) Well, obviously Ruby is slow, and it is about 1.5 orders of magnitude slower (Note: about 30 times ). This is not good news for Ruby enth

This article mainly introduced the Ruby meta Programming Dream Lover Method_missing Method Detailed explanation, this article explained how I should use Method_missing, the method proxy, Define_method, when uses method_missing, the meta method and so on content , the need for friends can refer to the following I recently read some articles (such as this one) to promote the use of method_missing in

Objective As the RubyGnome2 library becomes more sophisticated and ruby1.9 performance improves, writing GUI programs with Ruby gradually turns from my hobby to an important part of my job. Writing a program in Ruby is really fun, and it allows you to quickly get your ideas in a graceful way. A gem described in this article is an example of a very interesting feature with very little code that makes it eas

Is there such a problem in the application of computer languages? Python usage is much higher than ruby usage. If you want to know why the proportion of people who select the former is large, read the following article! I hope you will gain some benefits. Another problem is the database. Python thread programming has a large number of ready-made libraries, and many libraries have passed through large-scale

ActiveRecord programming guide in Ruby on Rails, rubyonrails Avoid modifying the default ActiveRecord (Table Name, primary key, and so on) unless you have a very good reason (such as a database not under your control ).Put the macro-style method before the class definition (has_many, validates, and so on ). Preference has_expect: through is better than has_and_belongs_to_expect. Has_validation: through allo

value with parentheses: Cat [Email protected]: ruby_src$./read.sh: 98765432DCBMust be curly braces Oh, otherwise read RET and Echo still in 2 process, equal to do not work Ah! You can do this:[Email protected]: ruby_src$my_val=$ (./read.sh)[Email protected]: Ruby_src$echo $my _val: 98765432DCBThis saves the returned results in the MY_VAL variable in the main bash process. Or you can handle it yourself in the while loop, because while loop and read are also in a process, the rewritten shell code

Ruby provides two access-level network services. At a lower level, you can access the underlying operating system, which enables both client and server-oriented connections and connectionless protocols to support basic sockets. Ruby also has a library of libraries that provide a higher level of access to specific application-level network protocols, such as Ftp,http. This tutorial introduces the concept o

Reprinted from http://blog.jobbole.com/53039/Every time you become a teaching assistant in the introductory CS course (students learn programming language), they are stuck with good exercises. Project Euler and similar problems are often difficult for beginners, especially for those who do not have strong math backgrounds.In this article, Adrian Neumann collects some ex