Ruby

#break: Terminate the program, jump out of the loop #next: Jump to the next loop, the result of this loop does not do the processing #redo: In the same condition repeated just the processing i = 0names = ["Perl", "Pyhton", "Ruby",

Rbenv is very useful, but with a small problem, each user needs to install and set up the version separately. The following installation steps can be installed under/usr/local/rbenv, and all users can share rbenv.   #rbenv安装 (/usr/local/rbenv) #安装依赖,

Include a table but or a variable in a ruby string. To replace an expression or variable with a different value1 Printf-style methods like Java or PythonTemplate ='Oceania have always been at the war with%s.'Template%'Eurasia' #= = "Oceania have

1) related knowledge of classes, objects, methods, variables, etc.classfixnum #Ruby下的数值的类型是Fixnum或者Bignum @ @words= ["Zero"," One"," Both","three"]; #类方法 alias Original_addition+ #使用alias重命名关键词defsay #向Fixnum中添加新的对象方法 P @ @words [self.to_i];

The above rough introduction of the next Ruby, originally did not want to install this, because I was learning through the website, can be compiled online. But given the comprehensiveness of the content, try it.Refer to the next person's

1Require'Matrix'2 3 classMatrix4 defto_pretty_s5s =""6i =07 whileI self.column_size8s + ="\ n" ifI! =09j =0Ten whileJ self.row_size Ones + =' ' ifJ! =0 As + =Self.element (i, J). to_s -J + = 1 - End thei + = 1 - End - s -

Recently because of learning puppet related knowledge, so learn the knowledge of Ruby, here is a summary of some of the introduction.The start and end statements of Ruby.　　BEGIN { code}end{ code }Variables in the class:The local variable "_"

Build tableActiverecord::schema.defineDo drop_table: HostsIf table_exists?: Hosts Create_table: HostsDo |table| Table.column: Name,: stringEnd Drop_table:d IsksIf table_exists?:d Isks create_table:d IsksDo |table| Table.column: host_id,: Integer

1. Installation and Setup(1) Git installation (slightly)(2) Initialization settings$ git config--global user.name "Lihuasun"$ git config--global user.email "12***[email protected]**.com"$ git config--global push.default matching #向后兼容新的git版本(3) The

Basic Learning of classes and methods in Ruby object-oriented programming, and ruby Object-Oriented Programming Enable class and monkey PatchesIn Ruby, the Class-defined method is no different from other statements and is executed in one row.

Introduction to rake and database data migration under Ruby on Rails, rubyrails I don't know whether you have written data to the Migration file through Migration. I believe you have done this for both laruence And Newbie. In fact, this is not

Ruby is garbled in Chinese characters in cmd and does not support OpenSSL. rubyopenssl Chinese garbled code SolutionYou cannot enter Chinese Characters in cmd. Change the cmd code page to 936: chcp 936 Ruby enforces UTF-8 for reading Chinese

Cloud 9 Adapt Project on Heroku (Week V), adaptheroku Advanced Software Engineering Week V --------------- Write in front ------------------------- Https://moonsea.herokuapp.com/ Attach the link. This is the function to be implemented. --------------

Example of writing strings in Ruby, and example of ruby strings String interpolation is preferred to replace String concatenation. # bad email_with_name = user.name + ' ' # good email_with_name = "#{user.name} " # good email_with_name =

Analysis of the use of regular expressions in Ruby, analysis of ruby Regular Expressions If you only need to search for the text of a string, do not use a regular expression: string ['text'] You can use string [/RE/] to query a simple structure.

Array and hash in Ruby. The array (arrays) and hash (hashes) of Ruby are indexed collections ). Both store the collection of objects and access them through keys. The key of the array is an integer. The hash List supports using any object as its key.

Rails Application Development 1. Bootstrap Installation Add Gemfile: gem 'bootstrap-sass', '~> 3.1.1' Run the bundle install command line App \ assets \ stylesheets \ adds the file bootstrap_and_overrides.css.scss. The content is @import

One Usage Details of method_missing in ruby metaprogramming, rubymethod_missing We know what the self of the top-level domain is?Copy codeThe Code is as follows:Puts self # mainPuts self. class # ObjectWe know that when a method is called, if no

Analysis of Proc class and Proc class method Proc. new in Ruby, procproc. new Proc is the process object obtained after the block and its context (the scope of local variables and the stack framework) are objectized. You can use Proc like an

For suggestions on Ruby on Rails view writing, rubyrails Do not directly call the model layer from the view.Do not construct complex formats in the view and output them to a method or model of the view helper.Use the partial template and layout to