Ruby

Optional ArgumentsSet default arguments, when we don ' t need to call it, we can simply skip it.def new_game (name, Year=nil, system=nil) { name:name, year:year, system:system = New_game ("Street figher II")Options Hash ArgumentSometimes,

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 -

Because you want to install the latest version, install it by compiling it.Prepare the tools and library files before installing:sudo Yum Install GCC gcc-c++ openssl-devel readline-devel gdbm-devel patchDownload file:Curl-o

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

Simple version:Base_char = (32..126). MAP{|I|I.CHR}-["'",'"'," " " " ` ","\ \"]puts (1..16). Map{base_char[rand (Base_char.length) ]}.joinComplex version:#tool scripts to quickly generate random passwordsBase_char=[]#defining the password base

When I started to learn Ruby, I couldn't figure out the difference between the symbol (the variable needs to add:) and the string, in order to design such a thing for the language. It makes me confused.First, the string object is different. For

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. --------------

Ruby basic environment variable settings and common interpreter commands, ruby interpreter Ruby Environment VariablesThe Ruby interpreter uses the following environment variables to control its behavior. The ENV object contains a list of all

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

The shortest editing distance calculation method implemented by Ruby, And the ruby Calculation Method The dynamic planning algorithm is used to calculate the shortest editing distance. Copy codeThe Code is as follows:# Encoding: UTF-8# Author: xu

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

Notes for writing Ruby code Annotations: Write the code of the self-explanatory document and let this part rest. This does not mean playing.Write comments in English.Use a space to separate comments from symbols.When more than one word is commented,

Explain the arithmetic operations in Ruby, and explain the Ruby arithmetic operations. Ruby supports a modern language with a series of rich operators. Most operators are actually method calls. For example, a + B is interpreted as,+ (B) the method