Ruby: Designer's Favorite
A language for developer happiness.
Focus on simplicity and productivity with the language behind Ruby on Rails.
Read code
like English.
Ruby is a programming language built for humans, not machines. It helps you build websites fast, without typing the same boring rules over and over.
Read the Guide5.times do print "Hello! " end # Result: Hello! Hello! Hello! Hello! Hello!
1. What is Ruby?
Made for Happiness
Most computer languages make you think like a robot. Ruby was built to let you think like a human. Its main goal is to make the person writing the code happy.
Very Easy to Read
You do not need a lot of confusing symbols like {} or ; everywhere. If you can read basic
English, you can often guess what Ruby code does.
Gets Work Done Fast
Because it is so simple to read and write, people who use Ruby finish their projects much faster than people using older, heavier languages.
2. The "Gems" System
Imagine you are building a house. Do you chop down the trees and make the nails yourself? No, you go to the store and buy them.
In Ruby, pre-made tools are called Gems. If you need your website to take credit cards, you do not write the code from zero. You just download the "credit card gem". This saves hundreds of hours.
> gem install payment_maker
> Successfully installed payment_maker!
3. What is "Ruby on Rails"?
Ruby is the language. Rails is the starter kit.
Building From Scratch
-
1
Figure out how to connect to a database.
-
2
Write security rules so hackers stay out.
-
3
Build a folder system to hold your files.
-
!
Takes weeks before you even start your actual website.
Building With Rails
-
1
The database connection is ready.
-
2
Security rules are already built-in.
-
3
Folders are organized perfectly for you.
-
✓
You start building your exact website on Day 1.
4. Convention Over Configuration
This is a fancy phrase with a very simple meaning.
Ruby on Rails assumes you want to do things the "normal way". So it just does them for you automatically. You only write code when you want to do something unusual.
5. Why Startups Love Ruby
Speed is money when you are a new company.
Rapid Prototyping
A startup might have a great idea, but they need to show a working website to investors in 2 weeks. Ruby on Rails allows them to build a "prototype" (a test version) faster than almost any other tool.
Saves Money
Because the work is faster, you don't have to pay developers to write code for months and months. Fewer hours working equals less money spent.
6. Real World Proof
You have probably used Ruby on Rails today without even knowing it. Huge websites started with this exact tool to grow fast.
Millions of online stores are powered by it.
Where almost all programmers save their code.
Started with Rails to connect people and houses quickly.
7. The D.R.Y. Rule
Don't Repeat Yourself
Ruby hates copy-and-pasting. If you find yourself writing the exact same chunk of code in three different places, Ruby tells you to stop.
It gives you easy ways to write a piece of code once, save it in a special box, and just point to that box whenever you need it again. This means fewer mistakes and less reading when you want to change something later.
8. Variables (Data Boxes)
A variable is just a virtual box. You write a name on the outside of the box, and you put information inside it.
In Ruby, you don't need to tell the computer what type of box it is. You just make a name and put something in it. It is that simple.
9. Methods (The Recipes)
A "Method" is just a set of instructions saved under a single name. Instead of writing the instructions every time, you just call the name.
You start with the word def
(define) and end with end.
Everything in the middle is the recipe.
10. How Rails is Organized
Rails uses a system called MVC. Think of it like a restaurant.
The Kitchen Storage
The Model handles the data. It goes to the database (the freezer) to pull out the exact user info (ingredients) you need.
The Plate
The View is what the customer actually sees. It takes the data and makes it look pretty using HTML and CSS.
The Waiter
The Controller takes the user's order, asks the Model for the data, and hands it to the View to be served.
11. Everything is an Object
Ruby is an "Object-Oriented" language. Imagine a box of Lego blocks. A block has a color and a size (its data), and it has the ability to connect to other blocks (its actions).
In Ruby, absolutely everything is a Lego block (an object). Even a simple number like 5 is an object that can do tricks!
String Object
Integer Object
Custom Object
12. The Secret Rule: MINASWAN
"Matz is nice and so we are nice."
Yukihiro "Matz" Matsumoto created Ruby. He is known for being extremely kind. The entire Ruby community adopted this rule (MINASWAN). If you ask for help online, Ruby developers are famous for being friendly to beginners, not snobby.
13. Built-In Testing
Imagine having a robot that clicks every button on your website in 2 seconds to make sure nothing is broken.
Rails comes with an automated testing system out of the box. You write a tiny bit of code that says "when I click checkout, it should charge money." Every time you change your website, the robot checks if that rule still works.
14. The Magic Translator
Active Record means you don't write SQL database code.
To find the first user in a database, you write this complicated math-like language:
SELECT * FROM users ORDER BY id ASC LIMIT 1;
To find the first user in Rails, you just talk in plain English:
User.first
Yes, it really is that short.
15. Built-in Security Helmets
The internet is full of bots trying to break into websites. If you build from scratch, you have to know every hacker trick and block it yourself.
Rails automatically turns on shields for the most common attacks (like SQL Injection, XSS, and CSRF). You don't have to be a cybersecurity expert to have a safe website.
16. Going Live
Putting your code on the internet is simple.
Write Code
Build it on your laptop.
Push to Git
Save it to the cloud.
Host Platform
Services like Heroku or Render make it live in 5 minutes.
17. "Is Ruby Dead?"
Absolutely Not.
People on the internet love to say older languages are "dead" because there is always a new, shiny toy to talk about.
Ruby continues to release massive speed updates every year. It still powers billion-dollar companies, and it remains one of the fastest ways for a solo developer or small team to build a real, money-making business.
18. Is Ruby perfect for everything?
Yes, use it for:
- Building database-heavy websites (like a store).
- Getting an idea onto the internet quickly.
- Small teams that need to work very fast.
No, skip it for:
- Making complex 3D video games.
- Writing software for tiny chips (like inside a fridge).
- Systems where one microsecond of speed is life-or-death.
Ready to build your first app?
Reading is good, but doing is better. Open the terminal and write your first line of Ruby code today.
More in this series
Master more skills with other tutorials from the Web Development series.
Data Management
- T-SQL: Transact-SQL: Microsoft's proprietary extension to SQL.
- PL/SQL: Oracle's Database Language: Procedural extensions to SQL.
- SQL: Structured Query Language: Manage and query relational data.
Systems Programming
- V: Simple, Fast, Safe: Compiled language for maintainable software.
- Nim: Efficient, Expressive, Elegant: Compiled systems programming language.
- Crystal: Fast as C, Slick as Ruby: High performance with beautiful syntax.
- Carbon: An Experimental Successor to C++: Performance with modern language features.
- Zig: Modern Systems Programming Language: Performance, safety, and simplicity.
- Assembly: Low-Level Machine Code: Direct hardware control and performance.
- Ada: Reliable Systems Programming: Safety and concurrency for critical systems.
- Haskell: Purely Functional Excellence: The gold standard of functional programming.
- OCaml: Pragmatic Functional Programming: Speed, safety, and expressive power.
- Erlang: The Language of Reliability: Building systems that never sleep.
- Rust: Safe Systems Programming: Performance without the fear.
- C++: High-Performance Engineering: The language of performance and control.
- C: The Foundations of Computing: Understanding the machine at its core.
Data Science
- Mojo: AI Programming Language: Python usability with C performance.
- R: Statistics and Data Analysis: Statistical computing and graphics.
- Julia: High-Performance Scientific Computing: Fast, dynamic language for numerical analysis.
Scientific Computing
- MATLAB: Engineering and Numerical Computing: Powerful tools for engineers and scientists.
Graphics Programming
- HLSL: DirectX Shading Language: Write shaders for DirectX graphics.
- GLSL: Graphics Shading Language: Write shaders for real-time graphics.
Game Development
- GDScript: Godot Engine Scripting: Rapid game development with Godot.
Hardware Design
- VHDL: Very High-Speed Integrated Circuit HDL: Describe and simulate digital systems.
- Verilog: Hardware Description Language: Design digital circuits and FPGAs.
Enterprise & Backend
- F#: Succinct and Robust .NET Logic: Functional-first programming for the modern enterprise.
- Scala: Scalable Software Engineering: Merging Object-Oriented and Functional paradigms.
- Go: Built for the Cloud: Reliable, simple, and incredibly fast.
- C#: Modern Enterprise Logic: The backbone of the .NET ecosystem.
- Java: Enterprise-Grade Logic: The foundation of robust software engineering.
Web Development
- Elixir: Reliable and Scalable Logic: Building high-performance, distributed applications.
- Ruby: Designer's Favorite: A language for developer happiness.
- PHP: The Web's Engine: Powering the majority of the internet.
- TypeScript: Type-Safe Programming: Building scalable JavaScript applications.
- JavaScript: The Language of the Web: Powering interactive user experiences.
Mobile Development
- Swift: The Future of Apple Apps: Fast, safe, and modern.
- Kotlin: Modern App Development: The concise and safe JVM language.
- Dart: Client-Optimized Logic: Fast apps on any platform.
Scripting & Automation
- PowerShell: Windows Automation: The ultimate tool for IT professionals.
- Perl: The Swiss Army Chainsaw: Flexible and powerful text processing.
- Bash: The Power of Automation: Make your computer do the hard work.
- Python: Versatile Programming: Simplicity and power for every use case.