Introduction to Scala
Functional and object-oriented, on the JVM.
What Scala is, why it matters, and how to navigate this track.
Scala fuses object-oriented and functional programming on the JVM — expressive, powerful, and built for scale.
What is Scala?
Scala is a statically-typed JVM language with a rich type system and first-class functional features.
It underpins big-data tooling like Apache Spark.
Your first example
Here is Scala saying hello. Read it top to bottom — every line earns its place.
@main def hello() = println("Hello, world!")Hello, world!
Why learn Scala?
- Blends functional and OO paradigms cleanly.
- Full Java interop and JVM performance.
- The language behind Apache Spark and much of data engineering.
Where it is used
- Big data (Spark)
- Backend services
- Data engineering
- 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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