What Are Design Patterns

What Are Design Patterns

In this lesson — part of Pattern Foundations — you'll learn what are design patterns in Swift and why it matters in real work.

Why it matters

Patterns are proven solutions to recurring design problems — a shared vocabulary for teams.

Key ideas

• Creational, structural, behavioral
• When (and when not) to use a pattern
• Common patterns
• Patterns as communication

In practice

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

// Swift: factory
function create(type) { ... }

Try it yourself

Exercise: In Swift, refactor a big switch statement using the Strategy pattern.

Recap

You now understand what are design patterns and can apply it in Swift. Mark this lesson complete and continue to the next one.