Ruby

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

Arr = [1, 2, 3] 1) arr2 = arr. each {| element = element * 2} # Both arr and arr2 are still equal to [1, 2, 3] each. The changes to elements in the original array traversal are not saved.2) arr2 = arr. map {| element = element * 2} # arr is equal

I will first write down some of my experiences over the past two days. 1. How to Use gem to delete new versions and retain old versions We know that the method for clearing the old version of GEM is to update the new version of GEM cleanup. But if

How to use Ruby for Windows shell programming. For example, create an Internet Explorer instance.   Require " Win32ole "   # Include library IE = Win32ole. New ( ' Internetexplorer. Application ' )Ie. Visible =

This section describes the fileutils module of the file class filetest module of the Dir class. -------------------------------------------------------------Directory operation: Use the static method of the Dir class or create an Instance Object

One project uses the ruby language, which is not supported by sourceinsight by default. The supported methods are as follows: 1. Visit the sourceinsight official website to obtain Ruby language support. Http://www.sourceinsight.com/public/,

Ruby Deployment Tool Overview: vglad 1.3 release and Capistrano handover and Maintenance The recent message about jamis Buck's stopping Capistrano development has caused many people to worry about the future of the Deployment Tool. Fortunately, the

You have written a script for the new feature, but this feature does not allow adding records of the same name. What should I do? Delete related records during initialization? If you are not familiar with the business, the table structure, and the

When testing the model, one change was observe. I wanted to test it, but the observer refused to execute it in rspec, but there was no problem with test env in the console. It took me a day to debug and finally failed to solve the problem. If you

My environment is Ruby 1.9.2p290 + rails2.3.4 + mysql5.5.15. When I run "DB: migrate", the error message is as follows:!!! The bundled mysql. RB driver has been removed from rails 2.2. Please install the MySQL gem and try again: Gem install

ArticleDirectory Ruby-adding a directory to $ load_path-what does it do? Similarities: all three are defined in the kernel and contain the meaning of something. Differences: 1. requre and load are used for files ending with. RB.

In Ruby, the so-called block-based method refers to the abstraction of the control structure. It was initially designed to abstract loops, so it is also called an iterator.Syntax: method_name do... end or method_name {}   1 # Block call

"Require" can be merged into. RB proposal, and can be omitted ". RB ". in addition, it will only commit at the first time. If it is "require" again, it will ignore Code highlighting produced by Actipro CodeHighlighter

Use netbeans debug RubyCode Netbean debug Ruby Debug Ruby code in netbeans 1. Get the gems package ruby-debug-ide-0.4.6.gem for ruby-debug-ide now I only see 0.4.6 and 0.4.5 available, and other high versions will always have issues 2.

I. Judgment Structure   If ExpressionElsif expression  Else End IfExpression then end#Use then when writing a line  IfExpression#When the expression returns true, run the preceding code. ... Unless expression#When the expression is

Ruby supports arrays and hash. Both arrays and hash are accessed through indexes. The difference is that arrays are indexed by numbers, while hash indexes can be any object, therefore, the array access speed is faster (direct positioning), while

Conversion of GBK and UTF-8 Use GBK instead of gb2312, because GBK not only contains simplified Chinese, but also traditional Chinese, is a large character set. # Utf8 to GBK Def U2g (ucode)Begin " # {Iconv. Conv ('gbk', 'utf-8',

Http://article.yeeyan.org/view/52654/18184 Rack provides interfaces between the Web server and the ruby development framework. It frees framework writers from the heavy burden of writing a processing module for each web server, saving a lot of

Ruby on Rails win Installation I found the new technology Ruby on Rails. I will not talk about it any more. Let's talk about my installation process today! First, download Http://rubyforge.org/projects/rubyinstaller/ I got the latest! Then install

Ruby used to learn a lot from perl, one of which is the global magic variable. Among these variables, it is estimated that no $ _ is more strange. For example, the gets method has this effect: while returning the row data you just read, it also