types.js

// Variables declared by default are undefined
console.log("Begin example - 2");
var x,y = 10;
console.log("Value of x = " + x);	        // X value is not defined, hence has undefiend
console.log("Value of y = " + y);

// Types demystified
console.log("Type of x = " + typeof(x));  // Type of undefined is undefined.
console.log("--");

var a=null;
var b=0;
console.log("Value of a = " + a);	        // a value is null
console.log("Value of b = " + b);
console.log("Type of a = " + typeof(a));  // Type of null is object.
console.log("--");
var c = a/b;
console.log("Value of c = " + c);
console.log("Type of c = " + typeof(c)); // Type of NaN is number.
console.log("--");