hoisting js

console.log(Math.floor(5.95));
// expected output: 5

console.log(Math.floor(5.05));
// expected output: 5

console.log(Math.floor(5));
// expected output: 5

console.log(Math.floor(-5.05));
// expected output: -6

/*Hoisting is JavaScript's default behavior of moving 
all declarations to the top of the current scope (script or function).
Be carefull that only declaration gets hoisted NOT the initialitations*/

var x = 5;
alert("x is  = "+x+". y is = "+y);//result => x is = 5. y is = undefined.
var y = 7;

/*
note that the code doesn't produce the error "y is not defined" like
it would if we would omit y. It executes but not in the way you would want.
*/

let monTableau2D = [
     ['Mark' , 'jeff' , 'Bill'] , 
     ['Zuckerberg' , 'Bezos' , 'Gates']
 ] ;
 monTableau2D[1].push('test') ; 
 console.log(monTableau2D) ;
              //////////////////
let monTableau = ['un', 'deux','trois', 'quatre'] ;
monTableau.push('cinq') ;
console.log(monTableau) ;

			///////////////////

let monTableauAssociatif = {
     'prenom' : 'Mark' ,
     'nom'    : 'Zuckerberg' , 
     'poste'  : 'Pdg de Facebook',

 } ;
 monTableauAssociatif['nationalite'] = 'Américaine' ;
 console.log(monTableauAssociatif) ;

x = 5; // Assign 5 to x



elem = document.getElementById("demo"); // Find an element 

elem.innerHTML = x;                     
// Display x in the element

var x; // Declare x
 

Use Node JS