Ruby

1 Using multiple construction methods There are no constructors in Ruby like C + + or Ruby, but we can still create a similar number of constructors: Ruby Code Class Coloredrectangle def initialize (R, G, B, S1, S2) @r, @g, @b, @s1, @s2 = R, G,

You create an array by listing the elements in square brackets and separating them from each other by commas. The array of Ruby can accommodate different object types ruby> ary = [1, 2, "3"] [1, 2, "3"] Just like the string mentioned earlier.

1. Read-write properties of member variables: Attr_reader and Attr_writer class Test Def initialize (name) @name = name end attr_reader:name attr_writer:name end test = Test.new ("AAA") puts test.name test.name = "BBB" puts Test.name　　　　　　 If

First, in ruby1.8, class variables are shared by all subclasses and parent classes, and you can look at the following code: class　IntelligentLife 　@@home_planet　=　nil 　def　 self.home_planet 　　@@home_planet 　end 　def　self.home_planet=(x) 　　

This article mainly introduces the example of Ruby optimization inheritance class, this article directly gives an example of optimization and implementation code, the need for friends can refer to the following In the rails principle there is the

Hook methods are similar to event-driven devices that can perform a specific callback function after a particular event occurs, which is the hook method (more descriptive: The hook method can hook a particular event like a hook). , the Before\after

Open Class You can reopen a class that already exists and modify it dynamically, even if the class of a standard library like string or array is no exception. This behavior is called Open class Monkey Patch If you inadvertently add new

Ruby on Rails directory structure + app/#控制器, model, view, help method, mail, static resource + bin/#rails脚本 + config/#路由, database + db/ #数据库模式, migration file + lib/ # Expansion Module + log/ #日志 + public/#公共资源 + test/ #单元测试 -config.ru

Language-related settings and strings should not be used in views, models, and controllers. These words should be moved to a language file under the Config/locales. When the label of the ActiveRecord model needs to be translated, use the

Ruby Code Copy Code code as follows: If @user. Update_attributes (:p assword => params[:user][:p assword]) Flash[:notice] = ' Password modification complete ' Redirect_to:action => ' index ' Else Redirect_to:action => '

%q A string that replaces double quotes. When you need to put a lot of quotes in a string, you can use the following method directly without adding a backslash (\) to the quotation mark. Copy Code code as follows: >>%q (Joe said:

Requirements for: input points from the keyboard, in order to judge, 0-59 for the failure, print "You did not pass, please try next time!", 60-79 for passing, print "Your grades pass, please work harder!" ", 80-100 for good results, print" Your

Divided into the following sections:• Basic implementation• Reference the original object in the iteration, or change the value of the array directly instead of returning a new array• Pass an infinite number of arguments to the iteration• Basic

Since you are ready to use bootstrap in your project, you will be prompted for a ruby version at 1.9.2 during the installation of Bootstrap, while the Ruby version that is currently in use is the 1.8.7 that comes with the Mac system. So you need to

defaes_encrypt()cipher = OpenSSL::cipher::AES. New(+, : CBC) Cipher.encrypt Cipher.key = "quck7295abvdefgh" data= ' sssssdsadkjak ' cipher.iv = "abcdefghhigk" encrypted = CIPHER.UPD Ate (data) + cipher.final base64.strict_encode64

Import Java.io.BufferedReader;Import Java.io.InputStreamReader;public class Cmd_ruby {private static string Execmd (String commandstr) {BufferedReader br = null;try {Process p = runtime.getruntime (). exec (COMMANDSTR);br = new BufferedReader (New

1, download the latest version of Rubyinstaller and install http://rubyinstaller.org/downloads/Set the path as shown, and I'll have enough of all the options when I install, eliminating the need for any later configuration hassles.2, after the

/home/zhenzhen/.rvm/rubies/ruby-1.8.7-p374/lib/ruby/site_ruby/1.8/rubygems/core_ext/kernel_require.rb:135:in ' Gem_original_require ':/home/zhenzhen/.rvm/gems/ruby-1.8.7-p374/gems/pry-0.10.3/lib/pry.rb:39:syntax error, Unexpected ': ', expecting ') '

1. Logical operators(1) Condition 1 | | Condition 2Condition 1 is false , only need to judge condition 2(2) Conditions 1 && conditions 2Condition 1 is true , the condition must be judged 22. Range operator(1) x.. Y from X to Y, including y(2) X...y

Statement: This article is not an article about nodejs and Ruby on Rails. It only describes the reasons behind the thinking and decision-making in our decision-making process. The two frameworks are both excellent and both of them are well designed.