typeof

 Usage of typeof

1. The type of null is object.

2. Uninitialized variables have undefined as the type.

console.log(typeof 23);

console.log(typeof 3.14);

console.log(typeof "RK");

console.log(typeof true);

console.log(typeof null);

let a;

console.log(typeof a); //Undefined

let b = 18;

console.log(b, typeof b);

OUTPUT