Ruby

Rexml is a processor written entirely in Ruby, with a variety of APIs, two classic APIs that are distinguished by dom-like and sax-like. The first is to read the entire file into memory and then store it as a layered form (that is, a tree). The

Introduced This is a short introduction to Ruby and it takes only 20 minutes to complete the reading. This assumes that the reader has already installed Ruby, and if you are not installing it, please visit the official Ruby website for download and

Global variables begin with $. They can be accessed anywhere in the program. The global variable has a special value nil before initialization. ruby> $foo nil ruby> $foo = 5 5 ruby> $foo 5 Global variables should be used with caution. They are

A local variable starts with a lowercase letter or an underscore (_). Local variables do not contain nil values like global and real variables before initialization. ruby> $foo Nil ruby> @foo nil ruby> foo ERR: (eval): 1:undefined local variable

Longest public subsequence, LCS, dynamic programming implementation. #encoding: Utf-8 #author: Xu Jin, 4100213 #date: Nov, #Longest-commom-subsequence #to find a longest commom subse Quence of two given character arrays by using LCS algorithm #

The string in the Ruby language is mutable, unlike a string in Java, C #, which is immutable. Like what Copy Code code as follows: str1= "ABC" str2= "ABC" In Java, for literal strings, a table is maintained inside the JVM,

In terms of technology alone, Ruby is really cool, making the programmer's job a fun and easy task!The following code shows how to find the prime number within 100: Copy Code code as follows: Using System; Namespace Mersenne {

1. Search first and then execute, otherwise the first line of execution program 2. function definition, class definition, module definition execution, causing these things to be defined 3. The statement that causes the program to exit, or to the

The new version of Will_paginate has abandoned this practice, instead of using the gem approach, this article through the establishment of a foobar application to understand the use of will_paginate. ============================== C:\>rails foobar-

#scanweb. RB #用法ruby scanweb.rb www.jb51.net to save the current results in C:\1.txt Require ' net/http ' Filename= file.new (' C:\1.txt ', "w+") If $*[0]==nil Puts "hehe, no input URL" Else h = net::http.new ($*[0], 80) RESP, data = H.get

Like Ruby Metaprogramming, puppet and chef use a lot of Ruby's language features to define a new deployment language.Share a few in the actual project used in the scene, limited capacity, if there is a better program, please leave a message to me:

1. Insert Sort Copy Code code as follows: SEQ = [3,4,9,0,2,5,9,7,1] 1.upto (seq.length-1) do |i|If seq[i] TMP = Seq[i]j = I-1while (j>=0 && tmpSEQ[J+1] = Seq[j]J=j-1EndSeq[j+1]=tmpEndEnd Seq.each {|num| puts num} 2,

In older versions of Ruby, the return value of an assignment statement is the return value of the method that sets the property. In Ruby1.8, the value of an assignment statement is always the value of the parameter and the return value of the method

In an expression, when Ruby sees a name like a, it needs to decide whether a is a local variable reference or a call to method a with no parameters. Ruby uses a heuristic approach to judge this situation. When ruby resolves the source code file, it

Some time ago to see a lot of people write the next sister script, I also write a Module Commonhelper require ' Nokogiri ' require ' Open-uri ' def down_load_xmz site_url = ' http:// Www.xxx.com "for index_page in 1..141

In the rails principle there is the idea of simplifying controller, enriching model. A simple inheritance optimization is shown below with an example. Especially when you have a change self variable in your method. Suppose we have the following

C # implements Ruby's negative index public class Invertiblelist: list {public new T This[int index] { get { if (Index >= 0) return Base[index]; if (Count + Index = 0) Base[index] = value;

If you want to see the source code for the ActiveRecord update_attribute function, a more common approach is to search for Def Update_attribute directly from the Rails source. Blog The Pragmatic Studio introduces a more convenient technique to

Because Windows file deletion mechanism is different from Unix like, so does not guarantee that the following code can be used in Windows, which child upper I test in Windows also good AH! Copy Code code as follows: #!/usr/bin/ruby

First, the preface IronRuby is a ruby implementation in. NET, and ruby.net this Open-source project, the main difference is that IronRuby leverages Microsoft's newest DLR, while Ruby.net is fully leveraging the original CLR implementations.