Basic Calculator operations using switch..case

const prompt = require("prompt-sync")();

let operator = prompt("Enter the operator (+, -, *, /) :");
let n1 = prompt("Enter the number : ");
n1 = parseInt(n1);
let n2 = prompt("Enter the number : ");
n2 = parseInt(n2);
let res;

switch (operator) {
  case "+":
    res = n1 + n2;
    console.log(`${n1} ${operator} ${n2} = ${res}`);
    break;
  case "-":
    res = n1 - n2;
    console.log(`${n1} ${operator} ${n2} = ${res}`);
    break;
  case "*":
    res = n1 * n2;
    console.log(`${n1} ${operator} ${n2} = ${res}`);
    break;
  case "/":
    res = n1 / n2;
    console.log(`${n1} ${operator} ${n2} = ${res}`);
    break;
  default:
    console.log("Operator is not specified");
    break;
}