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Typescript Mutable Readonly types

Azizul7m answered on April 10, 2023 Popularity 3/10 Helpfulness 1/10

answer Typescript Mutable Readonly types

Typescript Mutable Readonly types

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interface Person {
  readonly id: number;
  readonly name: string;
  readonly age: number;
}

// The syntax for Mutable is as follows:
type Mutable<T> = {
  -readonly [P in keyof T]: T[P];
};

type MutablePerson = Mutable<Person>;

// same as:
// interface Person {
//   id: number;
//   name: string;
//   age: number;
// }

const person: MutablePerson = {
  id: 1,
  name: 'John',
  age: 25
};

person.name = 'Mike'; // Okay
person.id = 2; // Okay

Popularity 3/10 Helpfulness 1/10 Language typescript

Source: dev.to

Tags: mutable readonly types typescript

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Contributed on Apr 10 2023

Azizul7m

0 Answers Avg Quality 2/10

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