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Interfaces - Introduction to TypeScript | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

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Interfaces

Another way to define object types

Interfaces define object shapes, similar to type aliases:

interface User {
  name: string;
  age: number;
}

function greet(user: User) {
  return `Hello, ${user.name}`;
}

Interfaces can be extended and merged. Use them for public APIs and when you might extend later.