Ruby Primer-ruby Installation _ruby topics

Ruby's installation can go to Ruby's official web site to download the Ruby1.56 Windows Installer package, install the after installation, open the DOS window, input ruby-v display

Ruby 1.8.6 (2007-03-13 patchlevel 0) [I386-mswin32] shows that Ruby has been installed successfully and the version number is Ruby 1.96.

After the installation, in the Start menu-> program appears ruby-186-20 this program. Click on him, there are five submenu below.

1. Ruby documentation (inside of Ruby's online documentation)

2.RubyGems (management tool for Ruby Library)

3.fxri (background and help tools for Ruby)

4.sciTE (an editing tool)

5. Unloading loading Tools

Ruby's execution:

After installing Ruby, Ruby's tools are added to the system's environment variables, so you can use Ruby to compile *.rb files in any path, but you have another option, the Fxri tool after installation. Fxri is a collection of help and backstage tools. He defaults to processing a IRB file in the main function. How you can enter your Helloworld inside, puts "Helloworld" will output Helloworld. So you don't have to write the RB file first and then compile it.

Ruby's Syntax:

Ruby's syntax is very simple. My full-time is a Java program, in Java, every program in the beginning must have a class. For example, HelloWorld can be defined to define the main method in HelloWorld. But Ruby because it can be used as a scripting language. We don't have to be in such trouble. In addition to Java, defining a variable must declare the type of the variable. Ruby doesn't need to directly

A=1

This allows you to declare a variable. Because the default ruby variables are mutable types. That is, you can a=1 then a= "HelloWorld", first let a point to 1 and then let a point to HelloWorld "

Object oriented:

Everything is Object! A thought continues in Ruby. The variables in Ruby are all objects, including the basic types. So you can use

3.times { puts  "Hello!" &NBSP}, because 3 is also an object, which has the Times method. In addition, you can also use "Gin joint" .length » 9  "Rick". Index ("C")  » 2 -1942.abs »  1942 sam.play (Asong)  »  "duh dum, da dum de dum&nbsp ..."