Ruby

1. Another talk about Ruby arrays. Class Test A = [1, 3, 5, 7, 9] puts A[0] #----->1 puts a[-2] #----->7 puts A[1 , 3] #----->[3, 5, 7] puts A[-3, 2] #----->[5, 7] puts a[1..3] #----->[3, 5, 7] puts a[1...3] #----->[3, 5] a[2] = ' cat ' #----->

Today, follow the depot example of the agile Web Development with Rails to automatically generate scaffold from a database table. That day in the company to do this example, feel quite smooth, did not expect to change to the home today after the

Proc Objects Proc are objects that are converted by blocks. There are four ways to create a proc, respectively: Sample code # Law one inc = Proc.new {| x | x + 1} Inc.call (2) #=> 3 # method two inc = Lambda {| x | x + 1} Inc.call (2) # =>

Let's look at a more interesting program. This time we're going to test whether a string matches a description produced by the Concise pattern (concise) encoding. In these patterns, some characters or character combinations have unique meanings,

In general, the definition of the observer pattern should be this: building a clean interface between the source of news that some object has changed and the Consumers O F that news. The Observer pattern establishes a clean interface between the

Regular match Speaking of Ruby, of course, the regular expression mechanism of the regular expression as a strong matching language has been more and more used in different fields, from string verification, matching, to Web page extraction and so

An iterator is nothing but a collection of methods supported. An object that stores a set of data members is called a collection. In Ruby, arrays and hashes can be called collections. The iterator returns all the elements of a collection, one after

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

Ruby's case expressions have two forms: The first form is close to a set of consecutive if statements: it lets you list a set of conditions and executes the statement that corresponds to the first true conditional expression. The second form is

Minitest, a new generation of ruby testing framework, has become the built-in test framework for Ruby 1.9, and it is said to be the default test framework for Rails 4, promising. Minitest Why is the latest Ruby and Rails preferred, and what are the

In Ruby we want to implement the method of traversing the specified directory, the online method is also very much, we can refer to reference, such as the traverse.rb file below the contents of: Copy Code code as follows:

In Word2013 documents, users can add Hanyu Pinyin to Chinese characters with the help of the phonetic Guide feature. In general, Pinyin is added to the top of the Chinese character. Since Chinese characters and Pinyin are merged into one line, the

The Active record provides two ways to delete operations. First, there are two class-level methods, delete and Delete_all, at the database level, and the Delete () method receives one or a set of Id,delete_all () methods corresponding to the

Directly on the code#!/usr/bin/env ruby#encoding:utf-8filename = Argv[0]file = File.Open (filename) =begin column-wise print =endfile.each_line do |line|  Myline = line.chomp! ary = Myline.readlines puts Ary[1]endfile.closeIterate through the rows

1.Rubymine new Ror ProjectFile->new Project??Select "New Application" under R ails??Click OK after build Ror project????2. Add ControllerAfter you create a new project , right-click new on the project name??Fill in COntroller's name, click OK??Build

After my first two posts "Ruby on Rails Environment Build" and "Ruby on Rails environment build MySQL database connection" We already have all the elements to develop Ruby on rails, but it's not always easy to hit commands on a DOS window every

Ruby's garbage collectorIn Ruby, almost everything you do requires memory.The job of the Ruby garbage collector is to manage memory and eventually release objects that are no longer in use. But this would sacrifice a bit of performance, and it would

Ruby provides four types of variablesLocal variable: Lowercase letter or _ StartInstance variable: an instance variable can span a method of any particular instance or object, meaning that an instance variable from an object to an object is changed.

When getting started with Ruby, it is easy to get confused by the small trick of its classes and modules. Here we will write it out to help you understand it. 1. Everything in ruby is an object Ruby is a Ground Object. All the components you see are

Compilation and installation from ruby source code in win7, and win7ruby source code compilation At work, we need to embed ruby c api in c ++ Code. However, compilation fails in the vs project, so we can find the reason by manually compiling ruby