//decalring multiple variables at once
let a, b, c;
a = "days of summer";

const d = 10,
  e = 20,
  f = 30; // cannot be reassigned but used as an initial value for something

const baseNumber = d;

function getNumber(baseNumber, str) {
  return `${baseNumber} ${str}`;
}

console.log("get Number => ", getNumber(d, a));