Ruby

Attr_reader method------Reading instance variablesAttr_writer method------Overwrite instance variableAttr_accessor method-----Read and write instance variablesclass PersonAttr_reader:name ---------1 Attr_writer: name ---------2 def initialize (

Ruby executes shell commands, often "," but this is a little bit of a problem, that is, this is a new sub-process, which means that if you use the ", then the entire method can only execute the shell once, if the following also depends on the

Discover SharpDevelop also supports Ruby, especially if you can directly use the WinForm control directly in the require"mscorlib"require"System.Windows.Forms, version=2.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089"require"System.Drawing,

Ruby InstallationInstalling Ruby from source code under Windows is a very hard errand that can be http://rubyinstaller.org/from theor http://railsinstaller.org/ download the packaged installer. Ruby Configuration Configuring environment

Transfer from https://ruby-china.org/topics/26120Because of the flexibility of Ruby, how good use, in fact, is more skillful, in fact, summed up, can be categorized as followsregular business, not the last resort, do not use meta-programming, do not

Brief introductionStackprof is a sampling-based tuning tool, what are the benefits of sampling? The advantage is that you can use it online and grab part of the data based on the built-in algorithm, affecting only a fraction of the performance. It

In a nutshell, it isClass can instantiate module noEverything else is the same.A little difference in inheritanceClass is a keyword that uses Application Scenarios for moduleAs a namespace, put the general const or their own class as mixin, put the

Sometimes, we need the server to control the remote server to do some things, while stable and reliable, will not suddenly hang out or anything.Then Ruby is a great tool.# encoding:utf-8#!/usr/bin/ruby# encoding:utf-8# Port 1990# Browser access:

The difference between recursion and iteration Recursion: 1) recursion is the invocation of itself within a procedure or function; 2) When using recursion, there must be a definite recursive end condition called a recursive exit. Iteration: Use the

The syntax for instance variables in Ruby is somewhat similar to the properties of Java objects, but the classes in Ruby also have strength variables,Class person @name = ' Hello ' def initialize (name,age) @name = name @age = Age End def

This is the source code in the book.File.foreach ('1.txt') do |x| if (($. = = 1) | | x =~/eig/). (($. = = 3) | | x =~/nin/) Then Print x endendWhere 1.txt content is as followsFirstsecondthirdfourthfifthsixthseventheigthninthtenthRead the

Code blocks are more or less exposed in other languages, such as Perl sort{$a $b}keys, the incoming code block is sorted by value, the closure is used in swift, further learning training closure, capturing The code style, such as value, has a deep

What Proc and Lambda have in common: Similar syntaxproc.new{|n| N**2}lambda{|n| N**2} Can be called with the. Call methodHello_proc = proc.new{puts "hello!"}Hello_proc.call #Hello!Hello_lambda = lambda{puts "hello!"}Hello_lambda.call

Ruby-2.1.1-#downloading rubygems-2.2.3% total% Received% xferd Average speed Time Time currentDload Upload Total spent0 0 0 0 0 0 0 0--:--:--0:00:01--:--:--0curl: (+) The requested URL returned Error:4 Found notThe requested URL does not exist: '

I, Definition: HSH = hash. New HSH = hash [1 => "A", 2 => "B"] HSH = {"1" => "A", 2 => "B "} Any object is supported as the key, and you are used to using symbol.   Ii. Common Methods #!/usr/bin/ruby def printResult(args) print args

Explanation of the method_missing method in the Ruby metaprogramming dream, rubymethod_missing I recently read some articles (such as this article) to promote the use of method_missing in Ruby. Many people are in a fire with method_missing, but they

Explain in depth the quick usage of Block code in Ruby and explain the rubyblock code. BlockDefinition some_array.each { |value| puts value + 3 }sum = 0other_array.each do |value| sum += value puts value / sumend A block is somewhat like the body

Tutorial on web Information capturing using Ruby program, rubyweb Websites no longer simply cater to human readers. Many websites now support APIs that allow computer programs to obtain information. Screen capture-time-saving technology for parsing

Delete merged git branch scripts in Ruby, rubygit It is much easier to use Git to manage code projects. However, after completing the feature branch or hotfix, you always forget to delete these useless branches one by one, repetitive manual work

Parse Ruby variables in detail, and parse Ruby variables in detail The location where the variable holds the data of the program to be used. Ruby supports five types of variables. In the previous section, we have gone through a brief description and