sinatra ruby

This article mainly introduces CGI Programming in Ruby, including creating Form forms and other basic content. if you need it, you can refer to Ruby as a general language, it is not just a language used in WEB development, but Ruby is the most common in WEB application and WEB tool development. With Ruby, you can not

How to configure the Ruby development environment in CentOS 7, centosruby This article will share with you a tutorial on how to configure the Ruby development environment in CentOS 7 for your reference. Here is a detailed introduction: Install Ruby 2.2 The Ruby version in the CentOS7 repository is 2.0, but if necessary

send message to object display We can send a message directly to the object: Ruby Code Copy Code code as follows: Class HelloWorld def say (name) Print "Hello,", name End End HW = Helloworld.new Hw.send (: Say, "world") We usually use Hw.say ("World"), but send can work on private methods. Not only so send can make the program more dynamic, let's take a look at an example: We have defined a class person, and we want

A local variable starts with a lowercase letter or an underscore (_). Local variables do not contain nil values like global and real variables before initialization. Ruby> $foo Nil Ruby> @foo Nil ruby> Foo ERR: (eval): 1:undefined local variable or method ' Foo ' for Main (Object) The first assignment of a local variable is done much like a declaration. If you

This is a research note, mainly to consult with you. In addition to the beginning, there is no extra nonsense, and no other customer experience is required. Please do not complain about poor readability. 1. Add a colon Before a name or string to get a symbol object. You can also use string # to_sym, fixnum # to_sym, and string # intern. 2. Generally, the key for hash using symbol is called to save memory and improve execution efficiency. 3. Why can I save memory? String in

Ruby string forzen and unfreeze problem string processing is the first problem question to learn a new language When we look at the return of super people, remember there's a superman named freeze in it? This guy has a trick, drink water, and then blow everything out and then freeze. This is not Ruby, and freeze exists. The code I wrote today contains the following line:Strtmp = SD [0]. to_s.gsub! (/.../,

This article mainly introduces the use of circular statements in Ruby Tutorial, logic Loop statement is the basis of each programming language, need friends can refer to the Loops in Ruby are used to perform the same number of times as the code block specifies. This chapter details the looping statements that are supported by Ruby.

the same way, a car has four wheels, 200 horsepower, gas as a different tank and a capacity of 25 liters.A class is defined in Ruby: To implement object-oriented programming with Ruby, you need to first learn how to create objects and classes in Ruby. A class in Ruby always starts with the name of the keyword class

First of all, 2012 years, already have Ruby 1.9.3, why I want to install 1.9.2. Answer: Because I'm learning Ruby on Rails, the reference book Ruby on RAISL 3 tutorial is written according to 1.9.2, and Heroku server seems to support only Ruby 1.9.2 Start Ubuntu and install some related libraries with the following com

Some programming languages (such as C ++ and clos) provide multiple inheritance mechanisms: A class can inherit from multiple superclasses. For example, a house may inherit from a building class (together with the Office and hospital classes) and residence class (together with the apartment class ). Although multiple inheritance may become a powerful feature of a language, many object-oriented languages are not added to it because it increases the complexity and ambiguity of the language.

CentOS6.2 Install Rvm+ruby+rails (1) RVM The official website should be revised once,Using Java code Curl-l https://get.rvm.io | bash-s stable Download and install the RVM stable version. Not using Bash Soon after installing RVM, re-login to a new SSH, using RVM-V to check the version.(2) Install some libraries, compile and install other software or libraries will be used whenJava code Yum Install zlib zlib-devel sqlite-devel