How to determine a variable type in TypeScript?

Question

I have this logic,

.switchMap((data: ISearchModalPayload | number ) => {..... }

where data is either an interface object or a number.

How can I determine the data type before I carry on with my routine?

I tried the following, from this post, but none worked:

`I tried the following` - can you show exactly how you tried, because clearly, you don't have a class `C` in your code — Jaromanda X, Mar 13 '18 at 22:33
`if (typeof data === "number") { /* do number things */ } else { /* do object things */ }`? — CRice, Mar 13 '18 at 22:33
[how to determine variable type in javascript](https://www.google.com/search?q=how+to+determine+variable+type+in+javascript&rlz=1C5CHFA_enUS688US688&oq=how+to+determine+a+variable+type+in+jav&aqs=chrome.1.69i57j0l2.9624j0j7&sourceid=chrome&ie=UTF-8) — SaganRitual, Mar 13 '18 at 22:36
Okay, please learn the difference between Java, JavaScript and TypeScript. — Sebastian Simon, Mar 13 '18 at 22:56

score 1 · Accepted Answer · answered Mar 13 '18 at 22:34

1

if (typeof obj === 'number') {
  // do stuff
} else if (typeof obj === 'object') {
  // do stuff
}

answered Mar 13 '18 at 22:34

Eduardo Martínez

score 1 · Answer 2 · answered Mar 13 '18 at 22:35

1

Are you looking for the typeof operator? E.g.

typeof obj === "number"

answered Mar 13 '18 at 22:35

Koenvh

2 Answers2