How to check undefined variable in a ternary operator?

Question

I have an issue with ternary operation:

let a = undefined ? \"Defined!\" : \"Definitely Undefined\",
    b = abc ? \"Defined!\" : \"Definitely Undefined\", // Re         


        

Answer 1

   state = (typeof state !== "undefined") ? state : '';

This way you can check undefined variable in a ternary operator.