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Ruby-based optimal binary search tree algorithm and ruby-based optimal binary search algorithm The pseudo code in the introduction to algorithms is rewritten, plus the constructor for the solution of the first question in the Introduction Class Exercises.Copy codeThe Code is as follows:# Encoding: UTF-8= BeginAuthor: xu jinDate: Nov 11,201 2Optimal Binary Search TreeTo find by using EditDistance algorithmRe
Comparison of class variables and instance variables in Ruby, ruby class variable instances 1. The class variable name starts with @. A Class variable is shared by all instance objects of the class. The instance variable name starts with @, and each instance object has its own different instance variables; 2. class variables must be initialized before use; otherwise, an error is reported during use. If the
Summary of loop statements in ruby and summary of ruby loop statements While (when ...) Loop While Condition Statement 1; Statement 2; statement... End Single Row while LOOP (Statement 1; Statement 2; statement... ) While Condition Until (...) Loop Until condition = while not (condition) For... In Loop For variable in obj
, and you'll also be able to make it easy. To consume a Web Service based on the Rest API provided by a third party, like using the Model of basic data. Through search engines, you can find many similar articles that use rails for rapid development, such as creating a Blog system with Ruby on rails for 15 minutes. Ruby on Rails is also very friendly to the agile development process, incorporating unit test
Simple comparison of python and ruby syntax, pythonruby syntaxEnter the interactive Interpreter Python Irb/pry Set encoding # coding = UTF-8 # Coding: UTF-8 Package management easy_install/pip gem Pip install Markdown Gem install Markdown Annotate python single line comment # start Python multi-line comments use three single quotes (''') or three single quotes
Three methods for installing Ruby in Ubuntu Ruby is an open-source dynamic programming language. It has excellent syntax and can be used to build scalable Web applications. Ruby gems can greatly improve the development efficiency of Ruby developers. There are several methods to ins
database and provides a wide range of public access methods, using the database server type. Database driven (DBD) layer. The layer is dependent on the database, and different drivers provide access to different database engines. MySQL, PostgreSQL, InterBase, Oracle and so on, respectively, using a different driver. Each driver is responsible for interpreting requests from the DBI layer and mapping these requests to requests that apply to a given type of database server. Prerequisite I
String processing in ruby is flexible. "ABC" [0] returns 97 as"ABC" [1] 98"ABC" [2] 99"ABC" [3] Nil"ABC" [-1] 99 forward number"ABC" [-2] 98"ABC" [-3] 97"ABC" [-4] Nil "ABC" * 2 returns "abcabc" supporting Multiplication "ABC" + "def" returns "abcdef" "Abcdef" [] "A" extracts one digit from the position 0"Abcdef" [1, 3] "BCD""Abcdef" [-3, 3] "def""Abcdef" [1 .. 3] "BC" from 1 to 3 Come to a riddleProgram Code highlighting produced by Acti
Arrays in ruby are created by square brackets. The initial values can be placed in square brackets and separated by commas. array elements can be of different types and support addition and multiplication. Ary = [1, 2, "3"]Ary * 2 Returns [1, 2, "3", 1, 2, "3"]Ary + ["Lee", "ho"] returns [1, 2, "3", "Lee", "ho"]Ary [] returns [1, 2] and obtains two elements starting from position 0.Ary [0 .. 2] returns [1, 2, "3"] From position 0 to position 2 Arr
inheritance of loading modules and classes: Module MdefPuts "' The ' method ' in module M"EndEnd Class CInclude MEnd Class D End obj = d.newObj.reportThe example method is defined in module M, the C class is mixed with module M, Class D is a subclass of Class C, and obj is an instance of Class D, the object of obj can call the method. From an object's perspective, suppose you are an object, someone sends you a message, you have to find a way to respond, and the idea is probably like this:
Introduction to Ruby and Rails Ruby is an object-oriented, dynamic scripting language. Its syntax is flexible and provides a rich library of classes. Therefore, the efficiency of writing programs in Ruby is very high. Although Ruby was very early (born in Japan in 1993), Ruby
Mongrel is a ruby HTTP library used to deliver Ruby web applications. In fact, do not use Apache mongrel alone can run the ROR program, the online tutorial using Apache is used to do web proxy, so that the website will not have a http://www.unbe.cn: 8081/such port declaration. I just did the test. Multiple port numbers won't affect me, so I only configured mongrel. The configuration steps are as follows:1.
1.1 install Ruby one-click installer on the download pageHttp://www.ruby-lang.org/en/downloads/ 1.2 install rails. Run "Gem install rails -- include-dependencies" in Windows cmd (start --> Run --> cmd) to install rails automatically.
ArticleDirectory 1. Install the Ruby interpreter 2. Install the rails programming framework 3. Install passpsenger and nginx If you want to learn rails without MacProgramFor members, Ubuntu is the best choice. Unfortunately, the UBUNTU World lacks the legendary text editor textmate and, in fact, t
Several programming skills for accelerating Ruby on Rails, rubyrails Ruby is often praised for its flexibility. As Dick Sites says, you can "Program for programming ". Ruby on Rails extends the core Ruby language, but Ruby itself makes this extension possible.
. OthersMultiple long integers are supported. The memory allows large numbers of computing operations.It has the exception handling capability and java exception handling function.Dynamic loading ). You can redefine yourself at runtime, or inherit or uninherit classes at runtime.Thread. Now ruby already has the thread concept. Ruby2.0 seems to support local threads.Reflection (Reflection ). Ruby can see th
Recently took over a mobile phone project. In the process of setting up the environment, some problems have been encountered, recorded in the following, and a personal solution.Development environment Win2003; JetBrains RubyMine6.3.31, download the latest version of Ruby, (Rubyinstaller-2.0.0-p598.exe, the latest version)Official website:http://rubyinstaller.org/downloads/2. Install RubyDouble-click
Recently in the study of using a non-relational database, the document-based database MongoDB is currently being used. Involves manipulating the MongoDB database using Ruby in a Windows environment. It is therefore necessary to install the Ruby development environment in a Windows environment.Follow the steps below:1. First i
A series of questions elicited by Easyios: the previous Cocoapods installation and use tutorial in the reprint explains why you should use Cocoapods, but to install cocoapods requires a ruby environment, Installing the ruby environment first requires the installation of Xcode (because of the Xcode development tool, he helps us
Build Ruby on Rails in Ubuntu Ruby on Rails is an open-source Web framework written in ruby., Similar to J2EE and PHP. Ruby on Rails is a very beautiful web development framework and incorporates the essence of agile development:Conventions greater than configurations. You will find that it is really a very beautiful
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