Ruby

When you are sharing objects in multi-threaded processing, multiple threads can modify the same object at the same time, possibly in an inconsistent state, and be aware of it when used. Example: Test.rb x = 010.times.map do |i| Thread.new do

Hidden Markov Model has three problems: 1) estimation problem: given an observation sequence o = o1o2... OT and model u = (a, B, π), how to quickly calculate the probability of observing the sequence o under the given model u, that is, P (o | U) 2)

First, let us know whether the materials are the same as the version of the environment in rails. The information is rails3.2, and the computer configuration environment is 4.0. This security precaution problem occurs. Most of these problems occur

  Ruby is really better than Java? Ruby on Rails Founder: Goodbye to JavaTwo

1 # global variable 2 $ global_variable = 103 class class14 def print_global () 5 puts "global variable in class1 is # {$ global_variable}" 6 end7 end8 class1obj = class1.new9 class1obj. print_global () 1 # instance variable 2 Class Customer 3 def

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

  Ruby is really better than Java? Ruby on Rails Founder: Goodbye to JavaTwo

1. preface whether using Ruby for system management or using rails for web development, periodic tasks may be encountered. They are subject to a certain period of time (1 hour, 2 days ......) continuously triggered. In Ruby, I think it is very

1. If Git is not installed, go to http://code.google.com/p/git-osx-installer/to download and install it. 2. Install RVM and run the following command to install it: Shell code.Bash

Jquery displays selected users, while jquery implements users Selecting a user is a common function. It mainly includes two Function Points (save selected options and display selected users) Functional requirements: 1. Select the user interface and

Solution to pod problems after upgrading to mac 10.10, 10.10pod I was curious about the latest powerful features of mac 10.10, So I upgraded the system to 10.10. I found that the following problems occurred when using the

There are a lot of articles about Watir installation on the Internet, but few of them are actually reliable. Either an error is reported or the installation package is incorrect. I started out as a beginner. It took nearly a week to summarize a

Rake I will not introduce it anymore. Ruby's Make is easier to use than Make in many aspects. Unlike Makefile, Rakefile itself is actually a piece of Ruby code, which has many advantages. On the one hand, in Rake, You Can Do Anything Ruby can do

Ruby is currently the most flexible and agile programming language. It has special application methods and can bring a pleasant programming environment to programmers. Here we will learn the skills for Ruby to get the current class name. Using pp (

Speaking of Ruby, of course, we need to mention its regular expression mechanism. As a powerful matching language, regular expressions are increasingly used in different fields, from string verification, matching, to web page extraction. Although

RDoc 3.10 is released. RDoc is a file system for Ruby source code. Like JavaDoc, RDoc can read the original file, analyze the syntax information and comment text in the source code, and generate documents in HTML format. Different from JavaDoc, RDoc

RubyMine 4.5 was released. This is a major new version that includes many improvements, including support for MacRuby, Capistrano, Slim, Sass, Rails Engines, development ID, Sinatra, and a series of other improvements. RubyMine is a brand new IDE

Before writing the plug-in, you need to confirm whether Vim supports Ruby by using the following command: $ vim --version | grep +ruby If the output is empty, it indicates that your current vim does not support Ruby. You need to recompile it and

N + 1 Problems N + 1 is the most common performance problem in database access. First, let's introduce what N + 1 is: For example, there are two tables in our database: MERs and Orders. Orders contains a foreign key mermer_id pointing to the

Ruby is a fully object-oriented interpreted scripting language. Its unique nature can help us easily and conveniently compile code. Next let's take a look at some usage of common Ruby libraries. Ruby regular expressions have many similarities