Ruby

The Observer pattern (sometimes called the Publish/Subscribe mode) is one of the software design patterns.In this mode, a target object manages all the observer objects that are dependent on it and proactively notifies when its own state

Class Arraydef Quick_sortreturn [] if self.empty?K = Self[0]Head = 0Tail = self.length-1While head (Tail-head). Times doIf Self[tail] Self[tail], Self[head] = Self[head], Self[tail]BreakEndTail = tail-1End(Tail-head). Times doIf Self[head] >

#Thread #1 is running Herethread. New { #Thread #This code} #Thread # This codeThread.new is synonymous with Thread.Start and thread.for.The value of the last expression in the code block is the value of the thread, which can be obtained by

1.Capistrano IntroductionWhat is it? ---a deployment tool. (The deployment is to install the application on the production server, or update the latest version, the Web server start restart and stop, the site into a maintenance state or restore it

Demand:Shopping Center cash register software, according to the customer to purchase the item unit price and quantity, calculates the expense, will have the promotion activity, hits 80 percent, 300 minus 100 and so on.One, use Factory

There are a number of classic drive architectures in Ruby, such as enumerators and generators. This is a simple introduction to the concept of generators. The generator is a function requirement that produces an object at a time, or a method that

First, you need to add a delete link on the index page and provide a delete confirmation that the user confirms the deletion and deletes the data directly.Modify viewsModify the App/views/posts/index.html.erb as follows:our blogs

1. Create a projectRails New Blog2. View the file structure belowTreeThe output is as follows, please pay attention to the part of the red circle.Gemfile, a gems for managing applications, a bit like Python's package, has a dedicated website to find

How can we be reduced to writing compression and decompression tools with Ruby under UNIX? Go straight to the shell! But please allow this cat to be ashamed to play with Ruby this time! In fact, Ruby Gem has a lot of compression decompression

This article describes how to use Nginx+passenger to deploy the Ruby on Rails environmentThe operating system version used in this article is CentOS6.51. Install Rubywget

First, environmental installationCentOS Operating System1, installation RVMCurl-ssl Https://get.rvm.io | Bash-s StableRvm-v to see if the installation was successful2. Install RubyRVM Install 1.9.3Ruby-v viewing the ruby version numberRVM command

Installation of ubuntu Download from the official website. I installed x64 version 12.04.   I. System Upgrade Change the Ubuntu Source 1. Back up the update source $ sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup 2. Modify the update

Introduction to ruby program structure and ruby program structure Generally, a ruby program is composed of one or more ruby source files. The source files are composed of modules. The module contains control structures, class objects, methods,

Analysis of DATA Objects in Ruby and RubyDATA objects Can this code be run? What is this DATA? Require 'erb' data = DATA. readmax = 15_000title = "hello world! "Content =" hello world! \ N "* 10max. times {ERB. new (data ). result (binding )} _

Explain in depth the quick usage of Block code in Ruby and explain the rubyblock code. BlockDefinition some_array.each { |value| puts value + 3 }sum = 0other_array.each do |value| sum += value puts value / sumend A block is somewhat like the body

Basic Ruby knowledge: Data Type and basic ruby knowledge I. numeric type (1) IntegerThere are two types of integer types. If the value is within 31 characters (four bytes), it is a Fixnum instance. If the value is exceeded, it is a Bignum

Examples of commonly used string processing functions in Ruby and ruby instances 1. Return the length of the stringCopy codeThe Code is as follows:Str. length => integer2. Determine whether the string contains another stringCopy codeThe Code is as

How to check whether the Gem is installed in Ruby. I recently participated in the 7won demo competition and decided to use ruby for development. So I encountered some questions and solved them. Record them here. In Ruby, Gem is a very common thing.

Ruby implements a powerful batch file deletion script sharing and ruby deletes file scripts. Recently, the number of apk packages on the server has increased, making manual rm operations too troublesome, it took several minutes to write a script to

Code for implementing the observer mode in ruby, javascript, and php, and ruby observer When I was asked about the observer mode in js during the interview, I have long known about this. It can be said that it is a very useful design mode in Dynamic