What is the question mark for in a Typescript parameter name

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export class Thread {
  id: string;
  lastMessage: Message;
  name: string;
  avatarSrc: string;

  constructor(id?: string,
              name?: string,
              avatarSrc?: string) {
    this.id = id || uuid();
    this.name = name;
    this.avatarSrc = avatarSrc;
  }
}

In id? what's the? for?

Aug 1 in TypeSript by Elton
• 400 points
81 views

1 answer to this question.

0 votes
answered Aug 3 by Abhinaya
• 1,160 points

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