Ruby metaprogramming and ruby Programming

Ruby metaprogramming and ruby Programming

An object model

Kernel Module

Kernel. private_instance_methods.grep (/^ pr /)

 

Private method

1. If a method receiver is not yourself, you must specify a receiver.

2. A private method can only specify one implicit receiver (a private method that can be called as a superclass)

The Class itself is the object of the Class. The class name is a constant.

Class <Module, the Module and Class names act as Directory roles and are organized in a tree structure

When the include Module is used, M is inserted into the ancestor chain.

Method 2

Obj. send (: method, arg) # dynamically distribute ojb. method (arg)

Module # define_method # Replace def with a dynamic method

String # grep (){}

Def method_missing (method, * args)

Puts "you called: # {method} (# {args. join (',')}"
 

End

Sanblocks

Kernel # local_variables () trace the bound name

The ruby scope is not similar to the nested inside java/c #.

Class Definition, module definition, closing the previous scope when calling a method

Instance_eval

Instance_exec Parameter

Packaging code

Proc lambda

& Proc represents a code block

In proc, return indicates that the returned value is from the defined scope.

Lambda ruturn indicates that