A TOUR OF RUBY 2011 ACM Class, Dong Xie

What is Ruby?  Dynamic programming language  Complex but expressive grammar  A core class library with rich and powerful APIs  Draws inspiration from Lisp, Smalltalk and Perl  Easy for C and Java programmers to learn  Ruby is designed to make programmers happy. ——By Yukihiro Matsumoto

 Optional parentheses  Parallel assignment  Punctuation Suffixes and Prefixes Simplified Expressions

Everything is an Object  Completely object-oriented language  Seeing Everything as an Object  even simple numeric literals and the values true, false and nil  Only single inheritance, the Mixin(Module)

Everything has a value  NO difference between expressions and statements  Everything has a value, even if that value is nil  Even control structures have their own value such as if, while, etc.

Classes are Open  Dynamic Programming Language  Not only dynamic-typed (like python, PHP, etc.)  Allows its users to freely alter its parts  Add, Remove, Redefine

Singleton methods  Per-object methods  Only available on the Object you defined it on

Iterators and Blocks  “A truly expressive feature”  Iterators —— loops  Blocks —— associate with a method invocation

Procs and Lambdas  Class Proc, Kernel.Lambda  Functions that can be manipulated as objects  Block as a single parameter  Instances of class Proc as parameters

And more…  Symbols are not lightweight strings  “Variable” constants  Fake keyword parameters  The universal truth  Missing methods  Metaprogramming capability  Packages —— RubyGems  ……

To learn more…  Official Site:  Ruby in a Nutshell  The Ruby Programming Language  The Book of Ruby  Programming Ruby  Ruby Cookbook

Any questions are welcomed… Q&A

Contact: Thanks for Listening