Ruby metaprogramming and ruby Programming
An object model
Kernel Module
Kernel. private_instance_methods.grep (/^ pr /)
Private method
1. If a method receiver is not yourself, you must specify a receiver.
2. A private method can only specify one implicit receiver (a private method that can be called as a superclass)
The Class itself is the object of the Class. The class name is a constant.
Class
Ruby implements the active mail push trigger program, and ruby implements mail triggering
After receiving the email, the mail server pushes the notification program. Is there any way to achieve this?
1. Client polling2. The server actively pushes data.
First, familiarize yourself with the protocol for sending and receiving emails:Net: SMTP (send mail)Net: POP3 (receive mail)Net: IMAP (receive mail)
There ar
the integration of a product line, cross-department cooperation, involving multiple bus and various Unix/Linux environments.
In many cases, these environments have both product standards and are not allowed to install other software.
Most of them do not install ruby, and shell is different. Some python do not.
However, perl is available on every machine !! Even the hardware-based BU uses embedded Linux with perl.
To facilitate some auxiliary work, yo
Brief explanation of the scope of Ruby Object-Oriented Programming and ruby Object-Oriented Programming
Scope
Ruby does not have nested scopes (internal scopes, which can be viewed as external scopes). Their scopes are completely separated. Once a new scope is entered, the original binding will be replaced with a new binding group.
The program will close the prev
Ruby captures web images and ruby captures images.
Some time ago, I saw a lot of scripts written by my sister, and I wrote one myself.
Module CommonHelper require 'nokogiri 'require 'open-uri 'def down_load_xmz site_url = "http://www.xxx.com" for index_page in 1 .. 141 doc_html = Nokogiri: HTML (open (site_url + '/share/comment-page-' + index_page.to_s) doc_html.css ("# comments p img "). each do | item_i
Ruby Web Real-Time Message backend server push technology --- GoEasy, ruby --- goeasy
More and more projects require real-time message pushing and receiving. How can we use Ruby to achieve the most convenient? We recommend that you use GoEasy, a third-party PUSH Service Platform. You can use its APIs to easily push messages in real time!
Browser compatibility: Go
Ruby concise learning notes (2): class inheritance, attributes, class variables, and ruby learning notes
1. How to declare a subclassCopy codeThe Code is as follows:Class Treasure In this way, the property names and descriptions of Thing classes are inherited by Treasure.
2. What are the parameters used to pass in the initialize method of the parent class in the following three methods?Copy codeThe Code is
Ruby Plus is a site offering free Ruby and rails related screencasts recorded by Bala paranj, much in the same vein as Ryan Bates 'railscasts. the screencasts are generally similar in length and overall format to those from railscasts. so far there are 29 episodes you can download. The first twelve screencasts in the archive (for which you have to register to download, alas) were exclusively
Explore some methods to optimize Ruby on Rails performance, rubyrails
1. There are two reasons for slowing down your Rails application:
Ruby and Rails should not be used as the preferred choice. (I used Ruby and Rails to do something I was not good)
Excessive memory consumption leads to a large amount of time for garbage collection.
Rails is a pleasant fram
string, the name of the identifier, and the way to create a symbol object is to precede the name or string with ":". Each object in Ruby has a unique object identifier (Identifier), which can be obtained using the object_id method (Getter).Block in RubyBlocks code block is a powerful feature of Ruby, and it's not an easy one to understand the design principle. In the b
Twitter and which applies to discourse.
2.6 Profile
Sometimes, these suggestions may not be universal. You need to figure out your problem. At this point, you need to use Profiler. Ruby-prof is a tool that every Ruby user will use.
To learn more about profiling, read Chris Heald ' s and my article about using Ruby-prof in Rails. There are some perhaps outdate
, starting with bash,
Later, bash was a little more complicated. For this reason, I also played bashdb. later, I really couldn't stand it.
I decided to change the script. based on the impression mentioned in "0", I decided to use ruby as the first choice of script. I learned and used it at work,
Ruby is very high.
2) later, he participated in the integration of a product line, cross-department cooperation,
A summary of some common file operations in Ruby and a summary of ruby operations
A lot of Ruby beginners need to learn. Now we are trying to use Ruby to write a script. Many file-related operations are used, which are sorted in stages here. This facilitates subsequent searches.
Whether the file or directory exists
Collections writing guide in Ruby and Ruby collections writing guide
Preference array and the literal representation of Hash (unless you need to pass parameters to their constructor ).
# bad arr = Array.new hash = Hash.new # good arr = [] hash = {}
When you need an array with elements of words (no spaces or special characters), you always use % w to define a string array. Apply this rule to only two
Installation will not say, the official website has, but today released ruby2.3, so updateEnter the. Rbenv directory, perform a git pull update, but update rbenv, execute rbenv install-l and do not have the latest 2.3.0 release version.Then I looked at the git repository for the Ruby-build plugin, with 2.3 code. Suspect this also to be updated, so.Go to the. Rbenv/plugins/ruby-build directory and execute gi
Ruby parsing JSONRuby Parsing JSON Example:
JSON = ' ["A", "B", "C"] '
puts "Unsafe #{unsafe_json
(JSON). Inspect}"
#输出Unsafe
["A", "B", "C"]
Ruby parses JSON to parse the above JSON string into array. Such a method is not safe, for example:
JSON = ' puts ' Danger'll
Robinson '
puts ' Unsafe #{unsafe_json
(JSON). Inspect} "
And what should we export? Unfortunately, there is
In the process of using ruby/rails, it is found that sometimes performance is unsatisfactory, such as the generation of a 3-layer tree with 600 items of the directory to spend 20ms, in order to improve performance in the learning to write Ruby module with C + +, the understanding of the Swig, Rubyinline a series of assistive tools that help you write C/A + + to improve
Matrix concatenation algorithm implemented by Ruby and ruby matrix concatenation
Dynamic Planning solves the problem of matrix concatenation, generates matrix sequences randomly, and outputs results in the form of (A1 (A2A3) (A4A5.
Code:
#encoding: utf-8=beginauthor: xu jin, 4100213date: Oct 28, 2012MatrixChainto find an optimum order by using MatrixChain algorithmexample output:The given array is:[30, 35,
Simple implementation of the Bubble Sorting Algorithm and Ruby version, and the Bubble Sorting Algorithm ruby
Algorithm principle:
Compares adjacent elements. If the first is bigger than the second, exchange the two of them.Perform the same operation on each adjacent element, from the first to the last. At this point, the final element should be the largest number.Repeat the preceding steps for all elements
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