null vs undefined types

	console.log( typeof( undefined ) );  // 'undefined'
	console.log( typeof( null ) );  // 'object'


	//Declared but unsassigned variable
	let a;
	console.log( typeof( a ) );  //  'undefined'


	let b;
	console.log( typeof( b ) );  //  'undefined'
	b = null;
	console.log( typeof( b ) );  // 'object'

Give it extension .js to see coloured texts as per JavaScript