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Ruby Basics and Syntax

Ruby is a human-centric, highly readable, object-oriented language designed for "programmer happiness."

1. Philosophy of Ruby​

  • Principle of Least Astonishment (POLA): The language is designed so that its behavior is always predictable and intuitive for the programmer.
  • Everything is an Object: Numbers, strings, and even nil are all objects in Ruby.
  • Elegant Syntax: Aims for natural-sounding code that reads like English sentences.

2. Basic Syntax​

name = "Ruby" # Variable declaration
puts "Hello, #{name}!" # String interpolation

3.times { puts "Helpful repeated output" } # Using Blocks

3. Flexible Method Invocation​

In many cases, parentheses can be omitted, leading to very concise and clean code.

def say_hello(target)
  "Hello, " + target
end

puts say_hello "World" # Parentheses are optional

4. Gems (Package Management)​

In the Ruby ecosystem, libraries are called Gems. Developers use a tool called Bundler to manage project-specific dependencies.

In the next section, we will learn about Ruby's "killer app," Ruby on Rails.

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