Ruby Learning Note One

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 "_" begins----the variable defined in the method and can only be used in a method.

The instance variable "@" begins-----The instance changes from object to object, and can span methods or instances.

The class variable "@@" begins------can be used across objects, belongs to a class, is a property of a class

Global variable "$" starts------cross-class use

Create an object using new

Object = class. New

When you create a new method with parameters, you must first define a initialize method:

The member function starts with a lowercase letter----, preceded by a def ending with end

Ruby Learning Note One