Вивчайте Type Aliases | Advanced TypeScript Features

Type aliases in TypeScript allow you to create custom names for specific types. This feature lets you define a type once and reuse it throughout your code, making your codebase easier to read and maintain. The basic syntax for a type alias uses the type keyword, followed by the alias name, an equals sign, and the type definition. You can use type aliases for primitive types, union types, object types, and more.


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// Define a type alias for a user object
type User = {
  id: number;
  name: string;
  isAdmin: boolean;
};

// Use the type alias in a function parameter
function greetUser(user: User): string {
  return `Hello, ${user.name}!`;
}

const admin: User = { id: 1, name: "Alice", isAdmin: true };

console.log(greetUser(admin)); // Output: Hello, Alice!

You should use type aliases when you have a type definition that appears multiple times or is complex enough to benefit from a descriptive name. Type aliases can make your code more readable by replacing long or repetitive type definitions with a single, meaningful name. They are especially helpful when working with union types, complex object structures, or when you want to clarify the intent behind a type used in your application.

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              123456789101112131415
            
// Define a type alias for a user object
type User = {
  id: number;
  name: string;
  isAdmin: boolean;
};

// Use the type alias in a function parameter
function greetUser(user: User): string {
  return `Hello, ${user.name}!`;
}

const admin: User = { id: 1, name: "Alice", isAdmin: true };

console.log(greetUser(admin)); // Output: Hello, Alice!

Все було зрозуміло?

Дякуємо за ваш відгук!

Секція 3. Розділ 3