Ruby

In Ruby, everything is an object. More precisely, everything in Ruby is a fully functional object. So, in Ruby, the number 4, the fixed-point number 3.14, and the string "Hi" are all objects. Obviously, they are a bit "special" because you don't

1 open and close a file Class method File.new opens a file and instantiates it as a file object, and his first argument is the filename. The optional second argument is called the mode string (which is also derived from c). He means to open a file

We may need to clean up when a method is finished. Perhaps an open file needs to be closed, the buffer data should be emptied, and so on. If there is always a single exit point for each method, we can safely place our cleanup code in a location and

Linux operating system: CentOS6.3 64bitruby:ruby-2.0.0-p247 I. Installing the development pack (using the default CentOS update source) Copy Code code as follows: # yum Install openssl* openssl-devel zlib-devel gcc gcc-c++ make

Cache and page display, this is the last part of the, I really did not think a serial actually spent a few hours. Tired... External links and tracking If you want to link and track external Web site resources, you can use the following helper

First, max_by,min_by the minimum value of the maximum value in the array according to the condition1 " This is a string " 2 arr = Str.split ("")3#"a"4# "string"Second, find finds the first element of a match1 " This is a string " 2 arr = Str.split (

Ruby installation in Linux Ruby installation package: Http://www.ruby-lang.org/en/downloads/Ruby-1.8.6-p111.tar.gz [you can install any version! The methods are the same. But remember that there are commands for these steps]Unzip and

Net: SMTP is easy to send emails, but it does not support sending attachments directly. You can install mailfactory to implement this function. 1) install mailfactory Run: Gem install mailfactory   2) supports Chinese The mailfactory

You need to install a bunch of gems locally since the Remote Installation didn't work or at least not stably.   By assumption that instantrails2.0 is ready on your xp platform, then you cocould go on the following steps:   1 download netbeans6

Class C @ const1 = 1 const2 = 2 @ var3 = 3 def self. m p @ const1, const2, @ var3; end def m2 P @ const1, const2, @ var3; C: M # OK # M # error: undefined local variable or method 'M' end endp C: const2; #2 # When the double colon (: :) method is

0. introduction I encountered a problem yesterday about object state transfer. Let me name it like this. A brief description is: for a person, he has functions such as eating, helping others, and falling in love, but these functions are sequential.

Ruby Study Notes Ruby usageThe first half of RubyWe are defining, we are creatingFor example, blue_crystal = 1, leaf_records = 5 The second half of RubyPutting things in motionFor example, pipe. catch_a_star Conclusion: 1. Defining things 2.

Ruby automation came into contact with the company. After writing several examples and applications under the company's framework, I also summarized the comparison and feelings between Ruby and Python development in the past. Of course, I know that

There is a class named open3 in ruby that can be used to execute system commands. However, after Ruby is installed in WINXP, open3 supports Linux by default. If you run the code, the fork () cannot be found () method error. Fortunately there is a

Fpdf supports Chinese PDF printing, but there are many disappointments. According to my current usage, I have summarized the following points: 1) The pdf_chinese font provided by fpdf writes the GB font into the Code. If we want to introduce other

Last year, the two most popular technologies were integrated: Ajax and Ruby on Rails. They became the focus of discussion at the serverside Java seminar in Las Vegas last weekend. In fact, you can say Ruby and Ajax have been officially

Document directory Three methods for running Ruby: Comments and branches Keywords Identifier Data Type Operator Basic statement Exception   Three methods for running Ruby: Ruby-e 'Ruby statement' Ruby source file Irbirb is a ruby

Http://www.songlin51.com/archives/667.html Ubuntu 12.04 redmine2.1 installation record When you install gem install rails, you cannot connect to rails. Solution: Search for railson http://rubygems.org/gems/railsto download rails. gem for

Ruby On Rails and rubyonrails Development Environment: Ubuntu 16.4 LTS Installing ruby through rvm 1. RVM Installation $ Gpg -- keyserver hkp: // keys.gnupg.net -- recv-keys 409b6b1796c275462a1703111084bb82d39dc0e3 $ Curl-sSL https://get.rvm.io |

Redis cluster building tutorial and troubleshooting, redis cluster building tutorial Here, the idea of building a redis pseudo cluster with six nodes on a Linux virtual machine is simple. Six redis instances are enabled on one virtual machine, and