Ruby

Method One: Install with Apt-getYou can complete the installation of Ruby directly with two commands.# sudo apt-get update# sudo apt-get install rubyOr# sudo apt-get install ruby2.0Method two: Using Brightbox PPA Warehouse Installation# sudo apt-get

In the Bowen (1) and (2), respectively, in 4 ways to write a prime filter algorithm, respectively, is JavaScript in Browser, node. js, Ruby and C; The end result is C fastest, node. js Second, JS in B Although not slow, but extremely unstable, So

Original address (outside the wall): https://medium.com/life-tips/ Should-you-learn-python-c-or-ruby-to-be-a-top-coder-infographic-188a5bdc9f54#.3ovedxuutTop programmers have unlimited prospects for employment, and even have the opportunity to

For newcomers to a new technology and language, building a learning environment is always a difficult topic, especially in the domestic network, the difficulty is greatly increased.After about more than 10 hours of hard fighting, I finally build a

Kernel#eval () method, you can directly execute Ruby code string(1) The Kernel#binding () method is used to capture the current scope to return a binding object that represents a complete scope(2) eval () can accept two parameters, the first is a

String is the most commonly used class in almost all object-oriented programming languages, and is no exception in Ruby, which is documented in several common methods of string in Ruby.Concat: Connect 2 strings, sample:puts "Hello". Concat ("world!")

Both require and require_relative are kernel methods. However, there is a difference between the two. Requrie filename 1) if filename is a relative path, it will be searched in $ laod_path ($ :). $ Load_path.unshift (file. dirname (_ file _)

Http://www.ruby-lang.org/en/downloads/ accessAfter installing Ruby with a third-party tool, you can use macports and rvm to install Ruby on Mac.After actual operations, I think the rvm method is better.Now start to use rvm to install Ruby1. Open the

In Ruby, you checknil?If an object is nil: article = nilarticle.nil? # => true empty?Checks if an element-like a string or an array F. E.-Is empty: # Array[].empty? #=> true# String"".empty? #=> true Rails adds the Methodblank?ToObjectClass:

Summary of basic operation methods for Hash types in Ruby, rubyhash 1. Create a hash:Just like creating an array, we can create a Hash instance using the Hash class: H1 = Hash. new # default value: nilh2 = Hash. new ("This is my first hash instance")

Example of the use of hundreds of semicolons and literal values in Ruby: ruby percent Use % () (abbreviated as % Q) for a single line string that requires interpolation and embedding double quotation marks ). Multi-line string, preferably heredocs.

Differences between require, load, include, and extend IN Ruby: rubyrequire Require and load are used to end files, such as. rb. Include and load are used to include modules in a file.Require is generally used to load library files, while load is

A summary of some basic syntax knowledge points in Ruby. Let's write a simple ruby program. All Ruby source files will use the extension. rb. Therefore, put the following source code in a test. rb file. #!/usr/bin/ruby -wputs "Hello, Ruby!"; Here,

Ruby uses threads to implement typical producer and consumer problem code instances. Sample Code: Copy codeThe Code is as follows:Require "thread"Puts "ProAndCon"Queue = Queue. new # Use the Queue queue for Thread SynchronizationProducer = Thread.

Ruby implements batch code sharing by adding prefixes to files, and ruby Prefix code sharing From the perspective of the designer, we get a large number of images, and the results are all file names such as 1.png and 2.png. We also need to convert

Ruby and pig process streaming file instances and rubypig process instances It is easier to use scripts to process data cleansing steps in big data operations. The following describes how to call ruby scripts to process data after pig loads hdfs

Remote RPC method calling through Redis One of the things I find I often study and excited about is the expansion of the system. Now, this has different meanings for different people. As part of the migration of Monolithic applications to the

Matrix concatenation algorithm implemented by Ruby and ruby matrix concatenation Dynamic Planning solves the problem of matrix concatenation, generates matrix sequences randomly, and outputs results in the form of (A1 (A2A3) (A4A5. Code: #encoding:

In the tutorial of using AJAX in Ruby on Rails, railsajax If you have never heard of Rails, you are welcome to return from an alien trip. In recent years, you have probably never heard of Ruby on Rails. The most attractive part of Rails is the

Introduction to MiniTest, a substitute for Ruby unit testing framework TestUnit, testunitminitest MiniTest is a new generation of Ruby testing framework. It has become a built-in testing framework of Ruby 1.9. It is said that it will also become the