Ruby

The ruby language has existed for a long time and has never been popular in China. Many people only know this language and there are few people. Every language has been developing for more than ten years and has become better and better. There must

Please considerCode Class TestPrivateDef self. TestPuts 'arst'EndDef TestPuts 'arst'EndClass Def Test2Puts 'arst'EndPrivateDef test3Puts 'arst'EndEndEndTest. TestTest. Test2BeginTest. test3Rescue standarderror => EP EEndBeginTest. New. TestRescue

An exception. Find the rails file in the bin directory under the ruby installation directory, for example, C: \ ruby187 \ bin.Modify rails by addingRequire 'thread' #! C:/ruby187/bin/ruby.exe # This file was generated by rubygems. # The

# To generate xml, you must create a rexml: document object instance.  Require "Rexml/document" File = file. New ("test. xml", "W + ")# Create an XML file and write the following content .Doc = Rexml: Document. New # Create XML content # Add a node

-Ruby home: www.ruby-lang.org -Ruby Repository: www.rubyforge.org raa.ruby-lang.org -Ruby documentation: www.ruby-doc.org -rails home: www.rubyonrails.com -newsgroup: http://groups.google.com/group/comp.lang.ruby/topics -Info: www.rubyinside.com

Some people say that textmate is good, but this is suitable for MAC systems. In Windows, I started with editplus and started with Ruby syntax. In addition, the tree map with directories on the left is very friendly, that is, the files in each

An unexpected problem occurs in a running program. A file to be read does not exist. When you want to store some data, the disk is full. You may enter inappropriate data.   Ruby> file = open ("some_file ") Err: (eval): 1: In 'open': no such file or

  #a sudoku solver in Rubymodule Sudokuclass PuzzleASCII=".123456789"BIN="\000\001\002\003\004\005\006\007\010\011"def initialize(lines)if(lines.respond_to?:join)s=lines.joinelses=lines.dupends.gsub!(/\s/,"")raise Invalid,"Grid is the wrong size"

Smalltalk   Like smalltalk, Ruby is also a dynamic, object-oriented language. You do not need to specify the Data Type statically. Everything is an object. In addition, both have a garbage collection mechanism. In smalltalk, flow control

Recently, I need a fast development language. Currently, the hot and fast development languages are Python and Ruby. Ruby and Python are both excellent scripting languages. Although their design philosophy is almost completely different, they are

3. identifier An identifier is a name.An identifier consists of letters, numbers, and underscores, but cannot begin with a number. It cannot contain blank or non-printable characters, or punctuation marks.The identifier that starts with 26

Use will_paginate for paging and simple query Run the gem install will_paginate command on the command line. The following result shows that the installation is successful.   Open books_controller.rb (your own Controller) Comment out all the methods

Document directory Ruby Module Mix-in Require and Load Module Summary Array String Regular Expression Iterator, code block, Closure   Ruby Module Ruby uses module... end to define a module. The module provides a namespace to prevent

Document directory Ruby class Class inheritance Polymorphism Dynamic Language Encoding   Ruby class The first letter is capitalized. The instance variable name starts with @, and the method name and parameter name start with a lowercase

Some time ago, I was working on an ERP project, and the performance of my notebook was poor (MB memory), so I could not do any development. In my spare time, I think of Ruby, a scripting language of interest. I had long wanted to explore Ruby, but

I wrote this article a long time ago. I can't find where the post is. I will try again. Because Google cannot search articles on oe.monweb.cn (this is a feature called Anti search engine) However, I declare that ASE has nothing to do with the recent

  1.Create Regular Expression A) reg1 =/^ [a-z] * $/# Place the schema definition between two forward slashes and return a Regexp object B) reg2 = Regexp. new ('^ [a-z] * $') # create a Regexp object C) reg3 = % r {^ [a-z] * $} # Use the frontend %

Module: The module definition is similar to the class, and the module keyword is used. However, a module cannot be instantiated or quilt-type. modules are independent and a module is an instance of a module class. The two most common functions of a

Self Context Ruby's self is similar to Java's this, but is quite different. Java methods are referenced in the instance method, so this generally points to the current object. Ruby code is executed row by row, so the context self has different

Today, the following Program has made me struggle for a long time. The concept of private in Ruby is really strange... Class Test private def test_print puts 'test' endendclass Test2 you cannot call endendTest2.new by adding self here. private