Ruby

Linux operating system: CentOS6.3 64bitruby:ruby-2.0.0-p247I. Installing the development pack (using the default CentOS update source): The code is as follows Copy Code # yum Install openssl* openssl-devel zlib-devel gcc

Open Class and Monkey patchesin Ruby, a class defines a method that does not differ from any other statement, and is executed on a line. The following example: Class Example def method_1 puts ' method 1 ' end class Example def

Instance_eval method This basicobject#instance_eval is somewhat similar to the Bind method in JS, when bind is passed this into the object, and Instance_eval is the block of code (context probes Probe) Passed in to the specified object, one for the

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

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

1." Hello "This write "Hello" to the screen with a new line tailed to.Print " Hello "Just like puts, but without new line.2." You know nothing ". LengthThis output of the string length." Jon Snow ". Reverse"Wons Noj"" Overwatch " . Downcase #--->

many friends in the Ruby language, because only contact, for the basic knowledge of Ruby do not know, such as Ruby on Rails installation and other basic tutorials, look at the installation Ruby on Rails tutorial (http://www.maiziedu.com/course/ruby/)

# 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

When your first started coding, errors were probably the last thing you wanted to see.After all, it's not a far stretch to associate "error" with "I messed up".Hopefully by now you've come to appreciate the value of a good error message. Take a look

1. The conversion between integers, floating-point numbers, and strings in RubyThe classes of ruby integers, floating-point numbers, and strings provide to_i,to_f,to_s three methods for converting integers, converting them to floating-point numbers,

Today I finally got Ruby debugging working in Eclipse. Below is the major setup steps involved, as well as some problems one might encounter along the.1. Install DLTK PluginTo make Eclipse a Ruby IDE, one popular plugin to be installed is, "Dynamic

Language itselfThe Ruby language supports syntax-level systems, frameworks, and even language-based methods for replication, commonly called meta-programming (meta-programming), on top of which are terminology mixin, dynamic definition of methods,

How to install the Redis database in Linux and share with the automatic STARTUP script, linuxredis Install Redis (1) download Redis wget http://redis.googlecode.com/files/redis-2.2.11.tar.gztar xzvf redis-2.2.11.tar.gz (2) Compile and install

Leetcode 200 Number of Islands, leetcodeislands Given a 2d grid map'1'S (land) and'0'S (water), count the number of islands. an island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. you may assume all

A deep understanding of the caching mechanism in Ruby on Rails, rubyrails Scenarios First, let me show you several pages in ChangingThePresent.org. I will display several locations on the site that need to be cached. Then, we will point out the

Parsing of MVC structure data transmission in Ruby on Rails, railsmvc If you have already developed a Rails-based application but are still confused about the data transmission between MVC, congratulations! This article is just to summarize the

Basic Process Control and basic Ruby knowledge process (1) condition judgmentCondition judgment is the basic formula:Copy codeThe Code is as follows:If expressionCodeEndIf the expression is not false or nil, the code part can be executed. For else,

Tutorial on implementing simple thing-Driven web applications using Ruby, rubyweb Introduction For Web applications, automated integration testing is a very important part. However, because these test cases are too dependent on the implementation

Hello World, rubyhello for Ruby beginners NOTE: For the Ruby Windows installation package, go to http://rubyinstaller.org/download to install it. I installed Ruby193 and wrote the first Ruby program to record my learning experience.Create a folder