How to use conditional operator in react js [duplicate]

Question

In many places I'm setting modified by, created by etc:

const test = this.state.isValueEdited
? {
  modifiedById: getLoggedInUser().userId,
}
: {
 // TODO
};

How could I check if getLoggedInUser has some value, than access .userId.. otherwise lets set null.

Thanks

Cheers

Answer 1

Also using the ternary operator

 modifiedById: getLoggedInUser() ? getLoggedInUser().userId : null

To avoid executing twice

const evaluation = getLoggedInUser()

{modifiedById: evaluation ? evaluation.userId : null}

Answer 2

You can use logical OR ||

modifiedById: ( getLoggedInUser() || { userId: null } ).userId

When the value returned from the getLoggedInUser returns falsy value the {userId : null} will act as default value

This expects value returned from getLoggedUser is falsy value in case it fails the condition