LearnThatStack Ace your next interview
TypeScript · question
Question 3 of 99

What is type inference in TypeScript?

beginner
← All TypeScript questions
Re-explain

Type inference is TypeScript's ability to automatically determine types without explicit type annotations. The compiler analyzes the code and infers the most appropriate types.

let message = "Hello"; // TypeScript infers string type
let count = 42; // TypeScript infers number type
let isActive = true; // TypeScript infers boolean type

function add(a: number, b: number) {
  return a + b; // Return type inferred as number
}
Rewriting in plainer words…

This answer doesn't lend itself to a diagram - it reads best . No credits were charged.

Why there's no diagram: “”

The interactive diagram is below the answer - jump to diagram ↓ · Below it, the related concept . Jump to it ↓

The diagram below the answer is the concept . Jump to it ↓

Tailored explanation · switch back to · ·
What should the new diagram focus on?
How well did you know this?
AI:

Saved in this browser - sign in to keep your review list.

How should your speech become text?

Listening… your words appear above as you speak - tap Stop when you're done.

Recording · cr - tap Stop & transcribe when you're done.

Transcribing with AI…

Voice:

Keep going - a few more words and AI can grade it.

Interview lens

Likely follow-ups, what you can say, and the weak answers to avoid.

Sign in free to open it Free account - the lens opens as soon as you're back.

Want a quick review of the fundamentals? See the TypeScript cheatsheet.

← Back to all TypeScript questions
Pro · $10/mo

85 of 99 TypeScript answers are in Pro.

Full answers, code samples, and AI explanations that go simpler or deeper. Cancel anytime.

  • Full answers + code
  • AI explanations, simpler or deeper
  • 1,000 AI credits / month
  • Cancel anytime