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Introduction to Ruby operators and statement priority, ruby operator priority Ruby is a language with strong expressive power. It is proud of its rich operators and syntactic sugar. Although Ruby has always regarded the principle of least surprise as one of its philosophies, but it is often surprising that it is diffic

Object array sorting in Ruby and Ruby object array sorting Sorting of Ruby object arrays The author has just come into contact with Ruby, because he previously thought that the script language syntax is not standardized and he is somewhat biased against the script language. For example, he does not need to learn PYTHON

Ruby learning plan-(0) preface, ruby Preface Preface Currently, C, C ++, Java, Object-C, and Swift programming languages have been used. The most familiar language is oc. After all, it depends on him for dinner. It is only a beginner's path for other languages. Because he has been engaged in iPhone app development, recently, I wanted to develop a project by myself, but there was no backend, so I was so

Global variable $ XX Object variable @ xx Local variable [A-Z] xx Constant [A-Z] xx Two pseudo variables self and nil:Self is actually a global variable pointing to the current object. The value of this variable is controlled by the interpreter and can only be read and cannot be modified.Nil is also a global variable controlled by the interpreter and cannot be assigned a value. 1. Global variable $ XXGlobal variables should be used with caution because their scope is script-level and can

Array usage in Ruby, ruby array usage Ruby arrays are ordered. What about any object ?? The set of integer indexes. The elements in each array are associated and an index is mentioned. Array subscript starts from 0, such as C or Java. Negative index assumes that the end of the array --- that is,-1 indicates the array index of the last element,-2 is the next eleme

Some basic operations on Ruby processing time, And ruby processing basic operations Get the current date and time: The following is a simple example to get the current date and time: #!/usr/bin/ruby -wtime1 = Time.newputs "Current Time : " + time1.inspect# Time.now is a synonym:time2 = Time.nowputs "Current Time : " + time2.inspect This produces the following res

is not a professional web crawler crawling, just before a very bad site to help people brush the ticket started to learn the web crawler tools.The initial time is to use the Python urllib2, get the page when the text processing, later in the forum to see the Beautifulsoap this level of artifact, Python processing this is really convenient, but later I met the Ruby and rails, from the faithless, Even read the metaprogramming

Some basic knowledge about modules in Ruby and basic knowledge about Ruby modules A module is similar to a class. It can also be called a class that cannot be instantiated ". Because the Class is a subclass of the Module Class, it may be better to say "Class = Module + instantiation Capability. What is the so-called module used? There are two main types of functions: Mix-in and namespace. Mix-in is actually

Tutorial on creating and using hash in Ruby and ruby hash Hash is a set of key-value pairs similar to "employee" => "salary. Hash indexes are completed by any key of any object type, rather than an integer index. Others are similar to arrays. The hash traversal order by key or value seems random, and is generally not in the insertion order. If you try to access the hash using a key that does not exist, the

An example is provided to explain the regular expressions in Ruby and the regular expressions in ruby. A regular expression is a special character sequence that can help match or find other strings or strings. The pattern used maintains a special syntax. The regular expression text is a slash between a pattern or any separator % r is as follows:Syntax: Copy codeThe Code is as follows:/pattern//Pattern/im #

Ruby meta-programming summary, ruby Summary When I was asked such questions today, I used to think that this is a broad concept. Even if I have used these features, but I still don't know this is called "metaprogramming" until today when I was asked, I just had an epiphany, and then I made a small summary on the Internet with some of my actual metaprogramming. The so-called meta-programming in

For Ruby introduction, see: http://www.ruby-lang.org/zh_CN/about/ I. IRB Interactive Ruby help and consoleProgramIn Windows. You can directly execute Ruby in IRB.Code. For example: Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> IRB (main ): 001 : 0 > " Hello World " => " Hello W

Enter the command line in ruby to compile sass (ruby) and rubysass Ruby(Or cmd) Enter the command line to compile sass as follows: (1) For example: first, create a total folder under drive F, such as the test folder, and then create folders such as html, images, js, and sass under the folder. (2) Create the sass file to be used in the sass folder. For example, co

I have always been very interested in Ruby on Rails. I want to see something that has been praised by many people, but I have been working on windows development, it is still a headache to build the development environment of Ruby on Rails, Which is why Ruby on rails has not been studied. I just saw InstantRails In javaeye, an All-In-One suite, which can help you

Explain the concept of range in Ruby and the concept of Ruby range. The scope is everywhere: From January 1, January to January 1, December, from December 9 to December 9, 50 to 67 rows, and so on. Ruby supports a range and allows us to use multiple methods: As sequence range As condition range Range As sequence range: First, it may be the most natural us

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