Ruby

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

Want to write their own ruby code, side deployment at any time to look around, Heroku domain name is not friendly, speed in the country and slow. So think up Capistrano, then learn ...Capistrano a little bit of introductory

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_

Workaround:1.koala Visual Compilation tool,Locate the engine.rb file under the sass-3.3.7 module in the installation directory, such as the following path:C:\Program Files (x86) \koala\rubygems\gems\sass-3.3.7\lib\sassENGINE.RB in this file, add a

Include a table but or a variable in a ruby string. To replace an expression or variable with a different value1 Printf-style methods like Java or PythonTemplate ='Oceania have always been at the war with%s.'Template%'Eurasia' #= = "Oceania have

Optional ArgumentsSet default arguments, when we don ' t need to call it, we can simply skip it.def new_game (name, Year=nil, system=nil) { name:name, year:year, system:system = New_game ("Street figher II")Options Hash ArgumentSometimes,

OrderRecently tried a bit coffeescript, and sass, have to say that these two together is indeed a good choice, familiar with the development is relatively fast.Of course to develop this first need to build the environment, here will need to have

Because you want to install the latest version, install it by compiling it.Prepare the tools and library files before installing:sudo Yum Install GCC gcc-c++ openssl-devel readline-devel gdbm-devel patchDownload file:Curl-o

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) +=

Recently because of learning puppet related knowledge, so learn the knowledge of Ruby, here is a summary of some of the introduction.The start and end statements of Ruby.　　BEGIN { code}end{ code }Variables in the class:The local variable "_"

Build tableActiverecord::schema.defineDo drop_table: HostsIf table_exists?: Hosts Create_table: HostsDo |table| Table.column: Name,: stringEnd Drop_table:d IsksIf table_exists?:d Isks create_table:d IsksDo |table| Table.column: host_id,: Integer

Empty? Whether the value of the object is emptyNil? Whether the object itself is emptyRB (Main):015:0>"'.Empty?=>trueIRB (main):016:0>"'.Empty?=>falseIRB (main):017:0>"".Empty?=>trueIRB (main):018:0>" ".Empty?=>falseIRB (main):019:0> Nil.Empty?

Ruby: Build a Ruby environment in Linux Ruby Learning Experience: Build a Ruby environment in Linux1. Preface2. Install the Ruby environment in Linux  I. Preface This blog post records the establishment of the Ruby programming environment in

The method for creating and parsing XML files in Ruby programs, rubyxml Use builder to create XML Builder installation method: gem install builder Require 'builder 'X = builder: XmlMarkup. new (: target => $ stdout,: indent => 1) # ": target => $

How to Improve Ruby On Rails performance (1) 1 Introduction to Introduction It is always said that Rails is so slow that it has become a common issue in the Ruby and Rails communities. However, this statement is not true. As long as you use Rails

Array and hash in Ruby. The array (arrays) and hash (hashes) of Ruby are indexed collections ). Both store the collection of objects and access them through keys. The key of the array is an integer. The hash List supports using any object as its key.

The shortest editing distance calculation method implemented by Ruby, And the ruby Calculation Method The dynamic planning algorithm is used to calculate the shortest editing distance. Copy codeThe Code is as follows:# Encoding: UTF-8# Author: xu

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

Detailed description of the structure of the Combination Mode and Its Application in Ruby Design Mode Programming, ruby Design Mode Definition:It is also called the merging mode or partial-overall mode. It is mainly used to describe the relationship

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