shortHand if else-if and else statement

Question

I have nested if else statements, which I added below in two statements, Instead of having a lot of lines I am looking to shorthand it.

Can anyone help me out.

Answer 1

Statement : 1 can be written as,

abc = (a !== -1 && b!== -1) ? "hai" : (c !== -1 && d!== -1) ? "hello" : "hurray";

So based on this try to write your own code for the statement 2 [Hint : use switch for that]