Ruby

Suppose you have written a rubyProgramFor example, LCX. RB: Now you want to use it to generate an executable file. EXE for a machine without a ruby environment. Specific Method: 1. Download Ruby GEM: http://rubygems.org/pages/download 2.

Class coloredrectangle Def initialize (R, G, B, S1, S2)@ R, @ g, @ B, @ S1, @ S2 = R, G, B, S1, S2End Def coloredrectangle. white_rect (S1, S2)New (0xff, 0xff, 0xff, S1, S2)End Def coloredrectangle. gray_rect (S1, S2)New (0x88, 0x88, 0x88, S1,

ArticleDirectory About C ++ 0x Lambda expressions Ruby code C ++ code With regard to C ++ 0x, the new standard C ++ 0x is expected to be launched by the end of next year, although it is nearing the closing stage, there are

Recently, rake was used for database migration. Ruby's activerecord only supports single-primary-key tables, which is very troublesome for the migration of compound-key tables.Assume that table A1 has a Sid primary key, and its storage is as follows:

Generally, the rdoc command is used for RubyProgramGenerate document Eg: Rdoc test. Rb To generate a document for the RB file of the entire project, you only need to run the rdoc command without the file name. Eg: Rdoc If there are classes and

Ruby is an open-source and is freely available on the web, but it is subject to a license .. (Open Source protocol ...) Ruby is a general-purpose, interpreted programming language. (multi-purpose, interpreted) Ruby is a true object-oriented

# Encoding: UTF-8 # --------- dynamic execution # execute 2 + 2 puts eval "2 + 2" # = "4 # execute 15*2 (q indicates that double quotation marks will be calculated, Q indicates that single quotes are output as they are.) number = 15 code = % q {#

  Development test cases)1. Open the editor2. Use. RB as your file extension3. Write "require 'watir'" in the first sentence of the test file to ensure that the watir tool is accessible.4. Open the browser and go to the application to be

Here, we will talk about installing Ruby through apt-get, which will eliminate the need for self-compiling. First, you must install both Ruby and ruby-dev when installing Ruby. The current version is 1.8, so you should execute the following command

For the original (English version), see here. Here are some of my translations and technical background documents:In 1980, I started programming. 2 Basic, 400 steps (I do not know how to translate) 3 in 1988, I met Emacs and shared it with more than

Ruby standard type   I. Numbers Ruby supports integers and floating-point numbers. integers can be of any length. Integers within a certain range are stored in binary. They belong to the fixnum type. If they exceed this range, they are

No browser is displayed$ Hide_ie = true How to obtain the path of the current fileFile. dirname (_ file _). to_s     Read files:Method 1:$ Result = 'd: // rs.txt'File. Open ($ result, "R") Do | file |File. each_line do | Line |If line. length>

Transferred from: http://blog.sina.com.cn/s/blog_4901d7bd0100b6lf.htmlrubyoperator reload   Reprinted tokenRuby's Operator Overloading is very interesting. Ruby allows "+" and other operators to be used as function names. Therefore, it is similar to

It may be a bit outdated, but the 12 tutorials provided by digitalmediaminute are still recognized as the classical required documents in the Ruby on Rails field -- A former student asked me a few days ago how I learned Ruby on Rails. the answer

Many Ruby syntaxes and special dynamic features remind me of oracle. Ruby can execute dynamic code through eval ("2 + 2") = 4 Eval brother banding: def eval_first puts eval("2+2") end def binding_elsewhere x=20 return binding end def

In Ruby, thread objects are also used to represent threads. Threads = [] 10. times do thread = thread. new do 10. times {| I | print I; $ stdout. flush; sleep rand (5)} End threads The join here is different from the join in the array. The join

I. Common ruby exception information: Exception name Common Causes How to throw RuntimeError Default exception thrown by raise Raise NoMethodError The corresponding method cannot be found for the object.

Finally, the full-text search of ferret was completed. It was not easy to get three full-text searches. The last two times on my mac, ferret has been confused. The main problem is that it cannot be used for Chinese word segmentation, and it is

I, Ruby Introduction:Ruby is "an interpreted scripting language for quick and easy object-oriented programming ". 1. interpreted scripting language Ability to make operating system CILS directly Powerful string operations and regular

Attr_reader: abc You can use Instance name. abc obtains the value of this variable, but cannot be modified. It is equivalent Def abcReturn @ abcEnd By the way, attr_writer and attr_accessor,Attr_writer: abc, which is equivalent Def abc = (abc)@