Javascript solution for those whoo need help

{ // Predefined variables

var i = 4;  // Integer
var d = 4.0;  // Double
var s = "HackerRank ";  // String

// Read input values

let num = parseInt(readLine());  // Read integer from input
let myDouble = parseFloat(readLine());  // Read double from input
let myString = readLine();  // Read string from input

// Print the sum of both integer variables
let sum = num + i;
console.log(sum);

// Print the sum of both double variables, rounded to 1 decimal place

let sum1 = myDouble + d;
console.log(sum1.toFixed(1));  // Print with one decimal place

// Concatenate and print the String variables

let newString = s + myString;
console.log(newString);

}