Ruby

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) 　　

ROR Official website:http://www.rubyonrails.org/As a starting point for understanding the technology, there's a 15-minute video that builds a blog that's worth a visit.Rolling with Ruby on

After using the rails new appname to build rails applications, we can view the directory structure of Rails applications through tree: Directory structure The application directory will have 11 directories of App, config, DB, Doc, lib, log, public,

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

First, the basic grammar1. Get the Nokogiri object directly as a string: Html_doc = nokogiri::html ("mr. Belvedere Fan club ") Xml_doc = Nokogiri::xml (" alf ") Html_doc and Xml_doc here are Nokogiri files. 2. Nokogiri objects can

Installation For Ubuntu, you need to install LIBXML2, libxslt these two components: $ apt-get Install LIBXML2 libxslt Then you can: $ gem Install Nokogiri Available optionsNokogiri provides some options for parsing

1. Establish an HTTP connection (send request parameters by Get method) Require "Open-uri" #如果有GET请求参数直接写在URI地址中 uri = ' Http://uri ' html_response = nil open (URI) do |http| Html_response = Http.read end puts Html_response

A collection of hashing-value pairs, similar to this: "Employee" => "salary". It is similar to an array, except that the index is the type of any object that passes through any key, not an integer index. Sequential traversal of a hashing or value

Ruby arrays are ordered, any object's?? A collection of integer indices. The elements in each array are associated with an index mentioned. The array subscript starts at 0, such as C or Java. The negative index assumes the end of the array---that

Git warehouse outputGit Archive--format=tar--prefix=actasfavor/head | (cd/home/holin/work/&& Tar XF-)Output to the/home/holin/work/actasfavor/directoryPosted by Holin at May 16, 2008 16:42Load controller and model in plugins# Include Hook code

Implementation of PRY,RONIN,MSF similar terminal under the interactive function, where the main use of RIPL gem: 1. Ability to invoke defined methods, such as Help2. Ability to execute system commands3. Ability to perform Ruby language parsing like

Recently there is a need to show the number as a fixed number of digits, the number of digits in the front with 0 supplements Like 5-bit: Copy Code code as follows: 3-> 00003 292-> 00292 12422-> 12422 It's easy to find Ruby.

When we are writing a module, it is more or less necessary to run the file directly or execute some methods, but this is not good for when the module is require or include, in Ruby, is there any distinction between running from the current file or

Recently participated in the seven-cow demo contest, decided to use Ruby development. So I ran into some questions and then solved them, and here's a record. In Ruby, Gem is a very common thing, it is the equivalent of Plug-ins, Ruby has a lot of

Cookies in Ruby, like other programming languages, have expires,domain,path,secure,name these references, so let's look at a simple cookie instance. Cookies and sessions are stored as strings, and other types of data types are coerced into strings,

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

To raise this question is to have an objective attitude towards the way of thinking.For the programming language, I have always felt that those I have not used, listening to some of the cows have mentioned the language is better.I have been to

Ruby traverses the contents of the file, the basic idea is to read row by line printing, is also a more common method:#!/usr/bin/env ruby#encoding:utf8file = File.Open ("/tmp/abc.txt") file.each_line do |line| Print Lineendfile.closeAnother way of

Today is my first time to contact the Ruby language, according to the tutorial written a very simple Ruby program, the file named Hello.rb, the content is as follows:Puts "hello,ruby!";But the execution is error:After Baidu's solution is as follows:

# reference http://stackoverflow.com/a/18490935/2037928# login as root# install  needed packagesapt-get -y install build-essential zlib1g-dev libssl-dev  libreadline6-dev libyaml-devcd /tmp# download appropriate ruby version