Ruby

Ubuntu upgrade Ruby to 2.1 1. Pre-installation update:sudo apt-get -y updatesudo apt-get install cmakesudo apt-get install -y build-essential zlib1g-dev libyaml-dev libssl-dev libgdbm-dev libreadline-dev libncurses5-dev libffi-dev curl git-core

My little brother was a beginner of Ruby, and I didn't use Linux.Search on the Internet a lot about the configuration of the development environment article, but always and actually a bit in and out, find n times the article, finally found the

ERROR: Could not find a valid gem ‘sass‘ (>= 0), here is why: Unable to download data from http://rubygems.org/ - Errno::EACCES: Permission denied - connect(2) (http://rubygems.org/latest_specs.4.8.gz)This is the work for me. Try this

#Ruby Built-in basic data type Nilclass,tureclass,falseclass,time,date,string,range,struct,array,hash#Numerice 1. Divided into Interger integer class. Interger is divided into Fixnum and bignum. #2. #Float浮点数#3.Complex plural. #dynamic

This article focuses on learning about Ruby you need to know about knowledge (RVM, GEM, bundle, rake, rails, etc.), the needs of friends can refer to the nextRubyThat's not going to be a lot.RVMTo help you install the Ruby environment, help you

  Require, load, and autoload are the methods defined in the kernel module. because both the class and the object class are mixed into the kernel module, you can call these methods whether self is an object or a class. These three methods are used

I suddenly found that Ruby is also good, and I want to learn it. Introduction This is a short Ruby entry, and it takes only 20 minutes to complete. Here we assume that you have installed Ruby. If you have not installed Ruby, visit the official Ruby

The explanation is good. It should be clear a lot. Ruby symbol details Cause Recently I have been studying Ruby on Rails. It is indeed an excellent database development framework. However, a large number of statements similar to the following are

We can think that module is a toolbox dedicated to storing a series of methods and constants. The module and class are very similar, but the module cannot create an instance or have sub-classes. They can only store things. For example: module Circle

Ruby is an object-oriented programming language, which means the programming structure it operates on is called "object" First go to the Code to understand the definition and usage of the class. Class computer $ manufacturer = "Mango computer, Inc."

The ruby regular expression is a Regexp class object.Main metacharacters Sn Meaning Example Xiaoming ^ Header /^ ABC/ ABC begin $ End of line /ABC $/ ABC too many rows

Method calls in ruby are allObject. MethodSo how to find this method for the object? First, you must understand the concept of the ancestor chain. The ancestor chain starts from a class to its parent class, and then to the parent class of the parent

Methods for distinguishing runtime sources in Ruby and Ruby for distinguishing runtime Methods When writing a module, we need to directly run this file or execute some methods, but this is not good for this module when it is require or include. In

Delete merged git branch scripts in Ruby, rubygit It is much easier to use Git to manage code projects. However, after completing the feature branch or hotfix, you always forget to delete these useless branches one by one, repetitive manual work

Rails accelerates and simplifies the development of Web applications, but it makes people feel immature, especially in terms of high-end enterprise-level functions. On the other hand, the speed, stability, and functions of the Java platform and its

Since its appearance, Ruby has been accepted by more and more programmers. Here we will give you a detailed introduction to the techniques related to Ruby's win32ole call. Ruby module OpenURI to get http/FTP address content Analysis of Ruby

The JRuby community recently released the latest version of JRuby 1.6.5. JRuby is a 100% pure Java implementation of the Ruby programming language. It integrates Ruby's concise syntax and a wide range of Java class libraries. According to

Today I will explain how to upload images in rails, which is the most common way to upload images. The rails version is 2.3.5. Create a write_pic modelThe content is as follows:Copy codeThe Code is as follows:Class WritePicRequire "RMagick"Require

Let's write a function to calculate the factorial. The mathematical definition of the factorial is as follows:N! = 1 (when n = 0)= N * (n-1 )! (Other Cases)In Ruby, you can write as follows:Copy codeThe Code is as follows:Def fact (n)If n = 01ElseN *

Let's look at a more interesting program. This time we will test whether a string matches the description produced by concise pattern encoding.In these pattern modes, some characters or character combinations have unique meanings, including:Copy