Introduction to Clojure
A modern Lisp for the JVM, built on immutability.
What Clojure is, why it matters, and how to navigate this track.
Clojure is a modern Lisp for the JVM — minimal syntax, immutable data, and a powerful approach to state.
What is Clojure?
Clojure is a dynamic, functional dialect of Lisp that compiles to JVM bytecode.
Its emphasis on immutability and its elegant concurrency story set it apart.
Your first example
Here is Clojure saying hello. Read it top to bottom — every line earns its place.
(println "Hello, world!")Hello, world!
Why learn Clojure?
- Lisp’s expressive power on a practical, fast runtime.
- Immutability makes concurrency far simpler.
- Interactive REPL-driven development.
Where it is used
- Backend services
- Data processing
- Concurrent systems
- Functional programming
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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