JavaScript Hoisting Console Input Output Questions

hoisting.js

 function emp() {
	console.log('111');
}
emp();
function emp() {
console.log('2');
}
Output > 2

var emp = function() {
	console.log('1');
}
emp();
function emp() {
console.log('2');
}
emp();
output > 
  1
  1


var x = 5;
console.log(x);
var x;
output > 5

var y = 10;
var y;
console.log(y);
output > 10

var y = 10;
var y = 12;
console.log(y);
output > 12

var z = 21;
let z;
console.log(z);
output > Identifier 'z' has already been declared

let y = 12;
console.log(y);
var y = 11;
output > Identifier 'y' has already been declared


var a = 5;
console.log(a);
var a = 7;
console.log(a);
output > 
  5
  7

console.log(y);
y = 15;
output >  ReferenceError: y is not defined


var x = 1;
console.log(x, y);
var y;
Output > 1 undefined

var x = 1;
console.log(x, y);
var y;
delete x;
delete y;
console.log(x, y);
output > will be same for both  : 1 undefined


 x = 1;
console.log(x, y);
var y;
delete x;
delete y;
console.log(x, y);
output >
  1
  ReferenceError: x is not defined