What It Is and Why

What It Is and Why

In this lesson — part of Getting Started — you'll learn what it is and why in Ruby on Rails and why it matters in real work.

Why it matters

This lesson builds an important part of your understanding.

Key ideas

• Understand the core idea
• See how it's used in practice
• Recognize common mistakes
• Apply it yourself

In practice

Here's the idea in pseudocode — the exact syntax varies by language:

// Ruby on Rails: example

Try it yourself

Exercise: Apply this idea in a short Ruby on Rails example.

Recap

You now understand what it is and why and can apply it in Ruby on Rails. Mark this lesson complete and continue to the next one.