Ruby

Overview
Yukihiro Matz
Ruby on Rails
Sinatra
Text Processing
Meta Programming
Black Magic
http://www.slideshare.net/itnig/the-black-magic-of-ruby-metaprogramming

Language Design
OOP
Dynamic and Weakly Typed
Module
Open Class
Interpreter Lambda
Block
Proc
Monkey Patch
Singleton Method
Dynamic Method
Duck Typing

Hello World
#{var} - interpolation
p puts the value as it is

Variables
Everything is an object

List
list.each{|param| statement}

cont. List
xxx! refers to a destructive function
map! changes the original list

Hash
hash.each do |k, v|
statements
end

Block/Yield/Proc
A block is a set of statement. It is not a function.
Proc makes a block a function

Function/Lambda
first class object
Lambda -> (param) {block}

Functional
map
find
select
reduce

OOP
initialize constructor
@xxx instance variable
attr_accessor setter/getter

Class Method
@@ class variable
self class method

Module
module cannot be instantiated
module can be mixed in

Singleton Method
add a method to a particular instance
only david changed, tom remains the same

Monkey Patch
override the existing method
append a new method
override the existing method

Dynamic Method
Define a new method at runtime
define_method()

Sinatra
A lightweight web server

Ruby

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