How to determine is a variable BehaviorSubject or not?

Question

I have a variable which can have type of Date or BehaviorSubject<Date | null>. I wanna know how can i check if the variable is a BehaviorSubject or not?

Does this answer your question? How to get a variable type in Typescript? — Nisharg Shah
– Nisharg Shah, Commented Aug 15, 2021 at 12:17

Joseph Bradshaw · Accepted Answer · 2021-08-15 12:21:10Z

3

If you do this in JavaScript you can do:

const behaviorSubject = new Rx.BehaviorSubject();
const isBehaviorSubject = behaviorSubject instanceof Rx.BehaviorSubject;

answered Aug 15, 2021 at 12:21

Joseph Bradshaw

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Comments

Hariom Balhara · Accepted Answer · 2021-08-15 12:30:55Z

1

Did you try the following

class BehaviorSubject {}
let myVariable = new BehaviorSubject()
console.log(myVariable instanceof BehaviorSubject)

edited Aug 15, 2021 at 12:30

answered Aug 15, 2021 at 12:16

Hariom Balhara

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4 Comments

Ali Bayat Mokhtari Over a year ago

if you run console.log(typeof myVariable) it will log Object

Hariom Balhara Over a year ago

I have fixed my suggestion. Please recheck

Joseph Bradshaw Over a year ago

This is specific to rxjs, so creating your own class BehaviorSubject doesn't help.

Hariom Balhara Over a year ago

I added a class example so that the entire code works. I saw that you have got the answer you were looking for :)

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