We are back with updates on our first session of GoBeyond-2018. The first training session on RoR (Ruby-on-Rails) technology, is covered by Parth Mewada, Sr. Rails Developer with 8+ years of experience. In this presentation, Parth is explaining the difference between Interpreted and Compiled and OOP and Functional Programming. Along with this, he is also describing Ruby classes and objects, global variable, instance variable, class variable and methods.

1. Ruby
Language
Session 1

2. Websites built on Rails
● Twitter
● Basecamp
● Hulu
● SlideShare
● GitHub
● Shopify
● Groupon
● AirBnb

3. What is Ruby ?
A dynamic, open source programming language with a focus on simplicity and
productivity. It has an elegant syntax that is natural to read and easy to write.
- https://www.ruby-lang.org
It was developed by Yukihiro Matsumoto (also known as Matz in the Ruby
community) in the mid 1990’s in Japan.
It is a pure Object-Oriented and an interpreted scripting language.

4. Say WHAAAAT ? OOP vs FP
According to Wikipedia, OOP “is a programming paradigm is based on the
concept of “objects”, which may contain data, in the form of fields, often
known as attributes; and code, in the form of procedures, often known as
methods.
Functional programming is the form of programming that attempts to avoid
changing state and mutable data.

5. Interpreted vs Compiled
Ruby is an interpreted scripting language and is run directly without first
compiling and generating the byte code.
With a compiled language, code you enter is reduced to a set of machine-
specific instructions before being saved as an executable file.
Interpreted programs can modify themselves by adding or changing functions
at runtime. It is also usually easier to develop applications in an interpreted
environment because you don't have to recompile your application each time
you want to test a small section.

6. Colour me curious. Installation
● Windows : RubyInstaller
● Ubuntu : Package manager
● Mac : Pre Installed !!!

7. Let’s compare shall we
Imagine you want to get the time one month from this very second. Here is
how you would do that in Python and Ruby languages
● Python
from datetime import datetime
from dateutil.relativedelta import relativedelta
new_time = datetime.now() + relativedelta(months=1)

8. And in Ruby...
● Ruby
require 'active_support/all'
new_time = 1.month.from_now

9. Let the magic begin
Ruby files have .rb as extension
Hello World
Classes and Object
Global variable
Instance variable
Class variable

10. Ruby basics
Array
Hash
Range
If..Else Case
Loops
Methods

11. Thank You,
Keep Learning.
Space-O Technologies