What is the question mark for in a Typescript parameter name

0 votes
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, 2022 in TypeSript by Elton
• 400 points
1,409 views

1 answer to this question.

0 votes
answered Aug 3, 2022 by Abhinaya
• 1,160 points

Related Questions In TypeSript

0 votes
0 answers

What is a type in Typescript for the Component class in Angular 2+?

I have a small problem, but big ...READ MORE

Jul 5, 2022 in TypeSript by Logan
• 2,140 points
733 views
0 votes
1 answer

What is "not assignable to parameter of type never" error in TypeScript?

All you have to do is define ...READ MORE

answered May 31, 2022 in TypeSript by Nina
• 3,060 points
56,975 views
0 votes
1 answer

What does the ! (exclamation mark) do in TypeScript?

The exclamation mark is called the non-null ...READ MORE

answered Jun 1, 2022 in TypeSript by Nina
• 3,060 points
1,131 views
0 votes
1 answer

What is TypeScript and why would I use it in place of JavaScript?

TypeScript is a superset of JavaScript which primarily ...READ MORE

answered May 31, 2022 in TypeSript by Nina
• 3,060 points
516 views
0 votes
1 answer

Cannot access web3 object with typescript and ethereum

You still need to instantiate it first. ...READ MORE

answered Sep 25, 2018 in Blockchain by slayer
• 29,370 points
2,874 views
0 votes
1 answer

How to apply zoom animation for each element of a list in angular?

Hey @Sid, do check if this link ...READ MORE

answered Jul 30, 2019 in Others by Vardhan
• 13,190 points
1,520 views
0 votes
1 answer
0 votes
1 answer

Can't bind to 'formGroup' since it isn't a known property of 'form'

In order to rectify this error, you ...READ MORE

answered Feb 10, 2022 in Others by Rahul
• 9,680 points
21,223 views
0 votes
1 answer
0 votes
1 answer

Is there any official Typescript definition for fabric.js?

Typically, packages in Definitely Typed aren't official ...READ MORE

answered Aug 3, 2022 in TypeSript by Abhinaya
• 1,160 points
1,474 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP