Chrome or node.js displays “undefined” on the console

undefined_console.js

// The JavaScript functions always return something. If you don't specify something to return in the function then
// 'undefined' is returned by default 

// So, console.log() will always return 'undefined' on node and chrome because the function doesn't return anything
let x;
let y = 3;

console.log(y);
// this console.log will return
// 3
// undefined
// 3 is the log of y and undefined is the return of the function console.log()

// to be more sure let's create a function that do the same job of console.log() but has a return
 funcrtion print(a){ 
   return a;
 }

print(y);
// this function will return only 3 without undefined
// 3
// 3 is the value of y and print make a return which it's not undefined