Ruby

To use sass, you need to ruby2.0 the above versionUbuntu upgrade Ruby to 2.11. 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-

Configure the Ruby environment before installing cocoapods, this article summarizes how to install the ruby environment. Installing the ruby environment requires first installing Xcode and then installing homebrew, and then installing RVM to install

#enconding: Utf-8require ' selenium-webdriver ' require ' rspec ' describe "Baidu Main Page" doit "should has Baidu button on the Baidu Main Page "DODR = Selenium::webdriver.for:ieurl = ' www.baidu.com ' Dr.get urldr.find_element (: ID, ' su ').

#!/usr/bin/rubyputs"Hello, Ruby, what is your name?"$name=stdin.getsputs"Hi, I am"+$namedefWelcome (Name,a = 9,b = 9,*c) puts"Hi #{name}"c.each{|x|Print "#{x}"}#print "a =" + $aA = 10; b = 11#print "Hi, B" + $bres = A *Bend#Welcome ("RUBY")Puts

Alternative class use, save code, clear and conciseUsing structSelectoption = Struct.new (:d isplay,: value) dodef to_ary[Display, value]EndEndOption_struct = Selectoption.new ("Canada (CAD)",: CAD)Puts Option_struct.display# Canada (CAD)Puts Option_

1, strong type, that is, the type conversion is not automatic, and C + + is a weak type. # Rubyi = 1puts "Value is " + i# TypeError: can‘t convert Fixnum into String# from (irb):2:in `+‘# from (irb):2

It's been confusing. Ruby is not like python,c can pass functions at will, and then execute them when needed. The essential reason is that Ruby's function is not an object.The following methods can be used to find out the data:def func (A, b) +=

=begin         #字符串          #数字, Several classes of numbers:   fixnum: The largest integer value that the native machine byte can store, and  bignum: An integer value that exceeds the maximum integer value that can be stored by the native machine

In ruby on rails, SideKiq is used for background tasks. railssidekiq Environment: ubuntu14.4, ruby2.1.5, rails4.2 1. A new rais project: rails new active_job -- skip-Bundle Enter the project folder: cd active_job Open the Gemfile: vim Gemfile Change

Tutorial on block code blocks in Ruby and tutorial on rubyblock code 1. What is a code block?In Ruby, the code between {} Or do... end is a code block. A code block can only appear behind a method. It is called by the yield keyword on the same line

Explain the single-piece method and single-piece class in Ruby, and explain the ruby single-piece Method Single-piece Method Ruby allows adding methods to a single object. This method takes effect only for a single object. It is called a

Ruby uses the REXML library to parse xml format data. REXML is a processor completely written in ruby. It has multiple APIs, two of which are distinguished by DOM-like and SAX-like. The first is to read the entire file into the memory and store it

Introduction to the adapter mode of Ruby Design Mode Programming, and the ruby Design Mode Adapter ModeThe adapter mode can be used to encapsulate different interfaces and provide unified interfaces, or make an object look like another type of

Ubuntu15.04 install RVM, First, please refer to this article Https://ruby-china.org/wiki/rvm-guide Official website of RVM Https://rvm.io/   1. Because many websites now turn to https links, according to the official rvm tutorial In addition, it is

NOIP record and noip record I have just finished my study today, and I have a holiday. I only have time to write my blog. My province is a weak Province. It seems that there are specialized OI teachers in three schools, and I have never heard of

Use Ruby to write HTML scripts to replace the example sharing of applets. A file contains the following content: select D for this question ............. The function I want to implement is to replace it: select D ................ This seems a

Ruby Object-Oriented Programming learning note, ruby object-oriented Open Class You can re-open an existing class and modify it dynamically, even if the class of a standard library such as String or Array is no exception. This behavior is called

Explain the instance_eval method in Ruby and its comparison with class_eval, rubyinstanceeval Instance_eval Method This BasicObject # instance_eval is a bit similar to the bind method in JS. In different cases, bind transmits this to the object,

Tutorial on using Nokogiri package to operate XML format data in Ruby, rubynokogiri Install For Ubuntu, you need to install libxml2 and libxslt: $ apt-get install libxml2 libxslt Then you can: $ gem install nokogiri OptionalNokogiri provides some

A Brief Introduction to Ruby's private, protected, and rubyprotected The following section of the program has plagued me for a long time. The concept of private in Ruby is really strange... Class Test private def test_print puts 'test' endendclass