1. ruby-introduction

Introduction to Ruby

Ruby is a high-level, interpreted programming language that is object-oriented and dynamically-typed. It was designed and developed in the mid-1990s by Yukihiro "Matz" Matsumoto in Japan, with the goal of making programming fun and productive for developers. Today, Ruby is a popular choice for web development, scripting, and building complex algorithms.


The syntax of Ruby is known for its simplicity and readability. Here's an example of a basic program in Ruby:

puts "Hello, world!"

In this example, puts is a built-in method that prints the text "Hello, world!" to the console. Ruby also uses semicolons to separate statements, and curly braces to wrap blocks of code.


Here's an example of a simple program in Ruby that calculates the factorial of a number:

def factorial(n)
  if n == 0
    n * factorial(n - 1)

puts factorial(5)  # Output: 120

In this example, we define a method called factorial that recursively calculates the factorial of a given number. We then call the method with the number 5 and print the result using the puts method.


The above example will output 120 to the console, which is the factorial of the number 5.


The factorial method takes a single argument n, which is the number to calculate the factorial of. If n is equal to 0, the method returns 1 (since the factorial of 0 is 1). Otherwise, the method recursively calls itself with n - 1 and multiplies it with n to calculate the factorial.


Ruby is used for a wide variety of purposes, including:

  • Web development: Ruby on Rails is a popular web framework built using Ruby.
  • Scripting: Ruby is commonly used for writing scripts to automate tasks.
  • Algorithm development: Ruby's simplicity and expressiveness make it well-suited for building complex algorithms.
  • Game development: Ruby has been used to build several popular games, including Sonic Pi and Metanet Hunter.

Important Points

  • Ruby is a high-level, interpreted, object-oriented programming language.
  • The syntax is simple and readable, making it easy to learn and write.
  • Ruby has a wide variety of use cases, including web development, scripting, and algorithm development.


Ruby is a popular programming language with a simple syntax and a wide range of use cases. It's well-suited for web development, scripting, and algorithm development. If you're looking for a language that's easy to learn and write, Ruby could be a great choice for you.

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