How to make sure an variation is interger or not a string

[killbill]

**Is there any solution to check an variation if it is a number or string. I try to use several way but has not found it solved:

• Convert to number: If it is a string, I can't check if the ouput is: NaN or not.
• Or I can't write some line of javascript code like: var [[CHECKCODE]] = !isNaN([[CODE]]) && input.trim() !== '';
  Give me advices by chance plz!**

[Roy Mustang]

[BAS Viet Nam]

@Roy-Mustang This is just for checking variable type in BAS

[BAS Viet Nam]

@killbill
Use

isNaN()

to check variables.

[killbill]

@Roy-Mustang Thanks you! (This one not work for me) When the result is NaN I can't check by next logical step!

[killbill]

@BAS-Viet-Nam Thanks!

[killbill]

I found this after I had you guys help. Thank a lot!