Ruby

Public classInvertiblelist: list { Public NewT This[intIndex] { Get { if(Index >=0)return Base[index]; if(Count + Index 0) Throw NewIndexOutOfRangeException (); return This[Count

#!/usr/bin/ruby=beginThere are 5 types of variables supported by RubyGlobal variables: The value of the uninitialized global variable begins with $0 and generates a warning using the-w option the assignment of global variables changes global state

ref:https://www.ruby-lang.org/en/documentation/quickstart/#!/usr/bin/env rubyclass megagreeter Attr_accessor:names # Create The object def initialize (names = "World") @names = Names End # Say hi to everybody def say_hi if @names. Nil? Puts "...

when testing with Ruby, there are a lot of times when you need some sort of data initialization and a post-mortem restore of the data, and these methods are sorted out below.Require "Test/unit"class Testanion #用例执行前只执行一遍初始化数据def Self.startupanion= '

A brief introduction to Ruby Foundation 1. Ruby installation under Windows Platform (1): http://rubyinstaller.org/downloads/(2) installation process Here we choose the installation path to D:\Ruby. The following 3 options are: (1) Whether TCLTK

=begin       conditional judgment statements include if statements, unless statements, case statements,=end#if  statements =beginif  conditions   then   processing 1elsif  conditions 2 then   processing 2else   processing 3end=enda = 10b =  20if a > 

1, strong type, that is, the type conversion is not automatic, and C + + is a weak type. # Rubyi = 1puts "Value is " + i# TypeError: can‘t convert Fixnum into String# from (irb):2:in `+‘# from (irb):2

ObjectiveThe language is rarely heard, it may not be used to hear too much about Ruby, work requires the language, need to start learning the language from 0, slowly learning simply ... It's amazing ... forgive me for being shallow. Originally very

P and the puts is a Ruby The most commonly used methods, many children's shoes may think they are similar, the use of the time is not paid attention to, but carefully looked up, they are clearly different. Let me give you an example:class Foo　　def

puts"Hello World"puts("Ni hao Shijie")# The parentheses behind the method inRuby do not write, and the puts method acts like the printf method . a = " Hello " puts a B =3 C =2 puts b + c Puts a + b #行8: Numbers and

Ruby methodThe method name starts with a lowercase letter and is used as a constant if you start with a capital letter ( this is odd )Define a method with no parametersdef method_name Expr. EndDefine a method that has a parameterdef method_name

In ruby on rails, SideKiq is used for background tasks. railssidekiq Environment: ubuntu14.4, ruby2.1.5, rails4.2 1. A new rais project: rails new active_job -- skip-Bundle Enter the project folder: cd active_job Open the Gemfile: vim Gemfile Change

A deep understanding of the block Feature in Ruby, rubyblock What is a block? Block is not uncommon in Ruby. The official definition of block is "a piece of wrapped code ". Of course, I don't think this explanation will make you better understand. A

Ruby's XML format data parsing library Nokogiri advanced, rubynokogiri I. Basic syntax1. Get the nokogiri object as a string directly: html_doc = Nokogiri::HTML("Mr. Belvedere Fan Club")xml_doc = Nokogiri::XML("Alf") Html_doc and xml_doc here are

Ruby uses the REXML library to parse xml format data. REXML is a processor completely written in ruby. It has multiple APIs, two of which are distinguished by DOM-like and SAX-like. The first is to read the entire file into the memory and store it

Ruby installation and running, Ruby installation and running Ruby Installation Notes OSX or linux is better Implementation of different versions: c ++, C, and java This C Ruby Installation Method Both linux and OSX are pre-installed.

NOIP record and noip record I have just finished my study today, and I have a holiday. I only have time to write my blog. My province is a weak Province. It seems that there are specialized OI teachers in three schools, and I have never heard of

Use Ruby to write HTML scripts to replace the example sharing of applets. A file contains the following content: select D for this question ............. The function I want to implement is to replace it: select D ................ This seems a

Explain the instance_eval method in Ruby and its comparison with class_eval, rubyinstanceeval Instance_eval Method This BasicObject # instance_eval is a bit similar to the bind method in JS. In different cases, bind transmits this to the object,

Resolve the application of proxy mode in Ruby design mode development, proxyruby Proxy ModeThe Proxy mode is a structural design mode. It mainly solves the problems caused by direct access to objects. For example, the objects to be accessed are on a