Why Ruby?

Most languages optimize for machines. Ruby's creator, Yukihiro "Matz" Matsumoto, optimized for something else: "I wanted programmers to be happy." That single design goal shaped everything.

What happiness looks like in code

Ruby reads remarkably like intent:

5.times { puts "step" }
["boots", "map"].each { |item| puts item }
"trail".upcase

Five times, print step. No ceremony, no boilerplate — even numbers are full objects with useful methods. Code that reads aloud well is code that's easy to write, review, and return to.

Rails: the startup engine

In 2004, Ruby on Rails made building database-backed web apps absurdly fast — and a generation of startups took the deal: GitHub, Shopify, Airbnb, Stripe (early), Twitch, Basecamp all grew up on Rails. Shopify alone processes hundreds of billions of dollars through Ruby today. The "Ruby is dead" meme is written, ironically, on platforms running Ruby.

First taste

puts prints a line. And yes — that's a method called on the number 3. More on that shortly; it's Ruby's whole worldview.

What's next

Run Ruby properly — puts, p, comments, and the friendly conventions.