Ruby Introduction
Discover the elegant programming language
💎 What is Ruby?
Ruby is a dynamic, open-source programming language with elegant syntax that is natural to read and easy to write. Created by Yukihiro Matsumoto in 1995, Ruby focuses on developer happiness and productivity.
# Simple Ruby program
puts "Welcome to Ruby!"
5.times { puts "Ruby is fun!" }
Output:
Welcome to Ruby! Ruby is fun! Ruby is fun! Ruby is fun! Ruby is fun! Ruby is fun!
Key Ruby Features
Readable Syntax
Ruby code reads like English
if age >= 18
puts "Adult"
endObject-Oriented
Everything is an object in Ruby
5.times { puts "Hi" }
"hello".upcaseFlexible
Multiple ways to solve problems
# Both work!
puts "Hello"
p "Hello"Rich Libraries
Thousands of gems available
require 'date'
puts Date.today🔹 Ruby Philosophy
Ruby follows the principle of least surprise and emphasizes human needs over computer needs. The language is designed to make programmers happy and productive.
Core Principles:
- Simplicity: Code should be easy to read and write
- Flexibility: Multiple ways to accomplish tasks
- Expressiveness: Say more with less code
- Natural: Syntax that feels intuitive
🔹 Your First Ruby Program
Let's write a simple Ruby program that demonstrates basic features:
# Variables and output
name = "Ruby"
version = 3.2
puts "Hello from #{name}!"
puts "Version: #{version}"
puts "#{name} makes coding fun!"Output:
Hello from Ruby! Version: 3.2 Ruby makes coding fun!
🔹 Ruby is Object-Oriented
In Ruby, everything is an object, even numbers and strings. This makes the language consistent and powerful:
# Numbers are objects
puts 10.class # Integer
puts 10.even? # true
puts 10.next # 11
# Strings are objects
puts "hello".class # String
puts "hello".length # 5
puts "hello".upcase # HELLOOutput:
Integer true 11 String 5 HELLO
🔹 Ruby Use Cases
Ruby is versatile and used in many areas of software development:
🔸 Web Development
# Ruby on Rails example
class User
def greet
"Welcome to our website!"
end
end
user = User.new
puts user.greetOutput:
Welcome to our website!
🔸 Automation Scripts
# File processing
files = ["doc1.txt", "doc2.txt", "doc3.txt"]
files.each do |file|
puts "Processing #{file}..."
endOutput:
Processing doc1.txt... Processing doc2.txt... Processing doc3.txt...
🔹 Ruby vs Other Languages
See how Ruby compares with its clean, expressive syntax:
Printing "Hello" 5 times:
Ruby:
5.times { puts "Hello" }Other languages typically need:
for(int i = 0; i < 5; i++) {
print("Hello");
}