ruby facets

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 Study Notes 1: Ruby Study Notes Notes: Ruby returns the last value in the method by default.To return multiple values, you can use an array.You can return a value by forcibly declaring return.The basic output method is to use puts (output line) and print (print directly ).The Basic Input Method is gets (read a row that contains '\ n' at the end of the row, w

Multiple ruby traversal folder code instances collected, ruby instances 1. traverse all files in the folder and output file names Copy codeThe Code is as follows:Def traverse_dir (file_path)If File. directory? File_pathDir. foreach (file_path) do | file |If file! = "." And file! = ".."Traverse_dir (file_path + "/" + file)EndEndElsePuts "File :#{ File. basename (file_path)}, Size: # {File. size (file_path )}

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

Ruby is a powerful object-oriented scripting language that allows you to quickly and easily object-oriented programming. Sometimes it's a little "fuss" to develop small projects using formal object-oriented languages such as Smalltalk, Eiffel, or C + +. And Ruby just meets the needs of these object-oriented programming. Of course, you can also use Ruby for genera

Ruby uses the simple factory mode and factory method mode in the design mode, and the ruby Design Mode I have read the ruby design pattern before, But I gradually forget it. Now I bought a big talk design pattern, which doesn't look so boring. By the way, I implemented the code in ruby. Simple factory mode: #-*-Encodin

It's pretty rare I recommend new blogs to follow on Ruby inside. Not because I don't like them-I link to their posts all the time!-But because it's hard to tell if a new blog is going to keep going and be worth your while. Well, the Ruby community has a new blog in its midst that's proving to be a must-read-Ruby Best Practices.It's a must-subscribe (RSS feed) fo

What is Ruby FPDF? Ruby FPDF is a Ruby portOlivier Plathey's excellent PDF generator,FPDF.FPDF is written in PHP, and as such can only be used from PHP scripts.Ruby FPDF, as the name suggests, is written in Ruby and can be usedFrom Ruby scripts.

Application instance analysis of appearance mode in Ruby Design Mode Programming, and ruby Design Mode What is the appearance mode? The appearance mode provides unified interfaces for a group of different interfaces in the subsystem. The upper-layer interfaces are defined. by reducing complexity and hiding the communication and dependency between subsystems, the subsystems are easier to use. For example, su

Tutorial on the basic usage of Regular Expressions in Ruby programs, ruby Regular Expressions Most of Ruby's built-in types are similar to other programming languages. Mainly include strings, integers, floats, and arrays. However, only script languages such as Ruby, Perl, and awk provide support for built-in expression types. Although the regular expression is re

Explain in detail the condition judgment statements in Ruby and explain the ruby judgment statements Ruby provides conditional structures, which are common in modern programming languages. Here, we will explain all the Ruby conditional statements and modifiers.Ruby if... else statement:Syntax: if conditional [then] co

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

machineInitialization completeStart the environment execution vagrant Halt shutdown environment by executing vagrant up in the appropriate directory when usedOther points of attentionAfter successful initialization, a configuration file named Vagrantfile is generated in the appropriate directory, which can be set for network, memory size, and other content.This article is from the "7692323" blog, please be sure to keep this source http://7702323.blog.51cto.com/7692323/1596334Build a

A few Ruby tips and Ruby tips Sequential call of code blocksCopy codeThe Code is as follows:Def touch_downYield [3, 7]Puts "touchdown! "EndTouch_down do | (first_down, second_down) |Puts "# {first_down} yards on the run"Puts "# {second_down} yards passed"End=> "3 yards on the run"=> "7 yards passed"=> "Touchdown! " It mainly refers to the use of array in block Retrieve elements from arrayCopy codeThe Code i

Example of the use of hundreds of semicolons and literal values in Ruby: ruby percent Use % () (abbreviated as % Q) for a single line string that requires interpolation and embedding double quotation marks ). Multi-line string, preferably heredocs. # bad (no interpolation needed) %( Do not use % q for strings without 'and. Unless many characters need to be escaped, the normal string is more readable.

Ruby string and array maximization problems, ruby Problems Max Method b=[1,3,55,777,2,4,6,8,0] For numeric data, max obtains the maximum value of the array, and min obtains the minimum value of the array. b.max => 777b.min => 0 It has no practical significance for comparing the size of string arrays,The example in ruby is # enum.max -> obj# enum.max { |a,

Ruby uses the proxy mode and decoration mode code instance in the design mode, and the ruby Design Mode Proxy Mode Requirements: James asked Xiao Li to chase Xiao Li for him (send dolls, flowers, and chocolate) No proxy code: #-*-Encoding: UTF-8-*-# suer class Pursuit attr_accessor: mm def initialize (mm) @ mm = mm end def give_dolls puts "# {mm. name} Show you the doll "end def give_flowers puts" # {mm. na

Detailed description of matching and replacement operations on strings by regular expressions in Ruby, and ruby Regular Expressions Regular Expression matching Speaking of Ruby, of course, we need to mention its regular expression mechanism. As a powerful matching language, regular expressions are increasingly used in different fields, from string verification, m

Three methods for executing periodic tasks (scheduled tasks) IN ruby: ruby periodic 1. Preface Whether using ruby for system management or using rails for web development, periodic tasks may occur. They are scheduled to take a certain period of time (1 hour, 2 days ......) continuously triggered. In ruby, I think it is