mediumFrontend

What are generics and why are they useful?

Q: What are generics and why are they useful?

**Generics** let you write reusable code parameterized by type while preserving type information: `function identity (x: T): T { return x; }`. They keep functions, classes, and types flexible yet type-safe — e.g. `Array `, `Promise ` — instead of falling back to `any`.

1.0k views

Understand the problem

Explain generics with an example.

generics

Attempt it yourself

Sketch your approach before reading the solution — that's what interviews test.

Nudge consolestandby

Stuck? Beam a request up — the console returns a conceptual nudge that guides your logic without spoiling the implementation.

Study the solution

Generics let you write reusable code parameterized by type while preserving type information: function identity<T>(x: T): T { return x; }. They keep functions, classes, and types flexible yet type-safe — e.g. Array<T>, Promise<T> — instead of falling back to any.

Solution ready — 2 min read

Classified // press E to declassify

Join the discussion

Discussion (0)

No responses yet. Be the first to share what you think.

Transmission complete // awaiting log

KEEP THE
STREAK ALIVE.

Dossier 21 of 70 decoded in the TypeScript track. One more won't hurt.

Back to track

Next up→

What is ReadonlyArray and readonly tuple?

Continue