Introduction to Swift
Apple’s fast, modern language across every platform.
What Swift is, why it matters, and how to navigate this track.
Swift is Apple’s fast, safe, modern language — the way to build for iPhone, iPad, Mac, and beyond.
What is Swift?
Swift is a statically-typed, compiled language designed to be safe by default and expressive to read.
It powers Apple-platform apps through SwiftUI and UIKit, and runs on the server too.
Your first example
Here is Swift saying hello. Read it top to bottom — every line earns its place.
print("Hello, world!")Hello, world!
Why learn Swift?
- The native language for the entire Apple ecosystem.
- Optionals and value types make whole categories of bugs go away.
- Modern, clean syntax with strong performance.
Where it is used
- iOS & macOS apps
- SwiftUI interfaces
- Server-side Swift
- Apple Watch & TV
How this track works
Every topic here has four views, switchable with the tabs at the top of each page:
- Learn — the clear, practical walkthrough you are reading now.
- Deep — every detail: edge cases, the full API, and what is really happening.
- Reference — a scannable, no-fluff lookup for when you already know the shape.
- Cheatsheet — the one-page summary, printable, for quick recall.
More like this
HTML Headings
h1 through h6 are the page’s table of contents. Use them for structure, never for size — that’s what CSS is for.
HTML Headings
h1–h6 are instances of HTMLHeadingElement. They take no special attributes — only the global set and ARIA — but there’s real depth in how they form the document outline and what you can do with them from JavaScript.
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