JavaScript How come a variable with type undefined when divided with type object gives a type number? variable income,come up with variable cost

I was trying to divide a variable with type "UNDEFINED" and other variable with type "OBJECT" and I was storing the value of the division in the third parameter and when i was checking the type for the third parameter it was showing number.

So can somebody explain me the problem.

<html>

<head>
  HELLO!!!
  <script>
    var a;
    var b = null;
    var c = a / b;
    console.log(typeof a);
    console.log(typeof b);
    console.log(typeof c);
  </script>

  <body>

  </body>
</head>
Answer:1

IN javascirpt NULL is considered as +0 in js if you divide 'undefined' by 0 then you will get NaN which is type of number.
You are dividing undefined with null so you are getting NaN Finally your expression will be

c = undefined/0; //It will return NaN

You can check if result is NaN which type is number

    var a;
    var b = null;
    var c = a / b;
    console.log(typeof a);
    console.log(typeof b);
    console.log(typeof c);
    console.log(Number.isNaN(c));
Answer:2

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