Ruby

Install RVM and Ruby: Shell$ curl-l Https://get.rvm.io | Bash-s Stable--ruby1 $ curl-l Https://get.rvm.io | Bash-s Stable--rubyReference articles:http://blog.111cn.net/abbuggy/article/details/8170899http://www.ruby-lang.org/en/downloads/ Windows1.

1, what is the code blockin Ruby, the code between {} or Do...end is a block of code. A code block can only appear after a method, and it is invoked immediately on the same line as the last parameter of the method, which is called by the yield

Proc is a process object which is obtained after the object processing of block and its context (local variable scope and stack frame). You can use proc like a nameless function, but it does not import the scope of local variables (you can use

Chinese garbled solutioncmd can not be entered in Chinese Change the CMD code page to 936: CHCP 936 Ruby read Chinese force set to Utf-8 You can add a comment statement to a file # Encoding:utf-8,ruby will be loaded in UTF-8 format

Inheritance allows you to create a class that is refined (refinement) and special (specialization) for another class. For example, in our jukebox system, the concept of "song" is encapsulated in the song class, and then, as the market grows, we need

1.try never throws an exception to return nil when not Copy Code code as follows: province_id = Province.find_by_name (Prov). Try (: ID) 2.find (: A: Condotions) method does not speak but with Copy Code code as follows:

Require,load for files, such as. RB, and so on, at the end of the file. Include,load is used to include a module in a file.Require is typically used to load library files, while load is used to load configuration files. 1, require: load a library,

0. System Environment Uname-a Linux moyo-desktop3.19.0-21-generic#21-Ubuntu1418:31:112015 x86_64 x86_64 x86_64 GNU/Linux1. Install Curl sudo apt-get Install Curl 2. Install RVM Curl-l Get.rvm.io | Bash-s Stable

The source connection for the most recent use of Ruby-china is not Using Gem Update to encounter this problem, It turns out that Ruby does not contain an SSL certificate, so the link to HTTPS is rejected by the server. The workaround is

The previous "[Ruby on Rails] and I learned hello World" mentioned that the route corresponding to the file is CONFIG/ROUTES.RBIn fact, we just added a line of code: Resources:p OSTsHowever, this code has multiple default routes, which can be

Https://github.com/sstephenson/rbenv Check out rbenv into ~/.rbenv .$ git clone https://github.com/sstephenson/rbenv.git ~/.rbenv Add to your for access to the ~/.rbenv/bin $PATH rbenv command-line utility.$ Echo ' Export path= '

May be the cause of the national firewall package, the installation of Railsinstaller after the execution always error, Bundle InstallDL is deprecated, fiddleFetching gem metadata from https://rubygems.org/.....Resolving dependencies ...

I've been working on Ruby for a while and have recently had some leisure events, learning about Ruby and preparing for future Ruby on Rails development.Ruby was founded in 1993 by as of Japan (まつもとゆきひろ/yukihiro Matsumoto). In contrast to chatty's

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")

The example parses the value types and constants in Ruby AND the ruby numerical constants. Number)Integer)There are two types of integer types. If the value is within 31 characters (four bytes), it is a Fixnum instance. If the value is exceeded, it

ActiveResource in Ruby on Rails When an HTTP response is in a different format (XML and JSON) than an existing one, you need to parse some additional formats to create a common format and use it in the category. The following methods should be

Common Ruby file operation code instances and ruby code instances # Create a 222. rb file and the input character File = file. open ("222.rb"," w + ") file. puts "123 \ nwadwa \ n12124124 \ ndwdw" file. close # output 222. rb content File. open ("222

A deep understanding of the block concept in Ruby and a deep understanding of rubyblock Block in Ruby is generally translated into code blocks, which seem a bit strange at the beginning, because there is no such thing in many languages. In fact, it

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

Tutorial on processing file input and output in Ruby, and tutorial on ruby processing output Ruby provides a complete set of I/O-related methods, which are implemented in the Kernel module. All I/O methods are derived from IO classes. Class IO