test.js

"use strict";

process.stdin.resume();
process.stdin.setEncoding("utf-8");

let inputString = "";
let currentLine = 0;

process.stdin.on("data", inputStdin => {
  inputString += inputStdin;
});

process.stdin.on("end", _ => {
  inputString = inputString
    .trim()
    .split("\n")
    .map(string => {
      return string.trim();
    });

  main();
});

function readLine() {
  return inputString[currentLine++];
}

/**
 *   The variables 'firstInteger', 'firstDecimal', and 'firstString' are declared for you -- do not modify them.
 *   Print three lines:
 *   1. The sum of 'firstInteger' and the Number representation of 'secondInteger'.
 *   2. The sum of 'firstDecimal' and the Number representation of 'secondDecimal'.
 *   3. The concatenation of 'firstString' and 'secondString' ('firstString' must be first).
 *
 *	Parameter(s):
 *   secondInteger - The string representation of an integer.
 *   secondDecimal - The string representation of a floating-point number.
 *   secondString - A string consisting of one or more space-separated words.
 **/
function performOperation(secondInteger, secondDecimal, secondString) {
  // Declare a variable named 'firstInteger' and initialize with integer value 4.
  const firstInteger = 4;

  // Declare a variable named 'firstDecimal' and initialize with floating-point value 4.0.
  const firstDecimal = 4.0;

  // Declare a variable named 'firstString' and initialize with the string "HackerRank".
  const firstString = "HackerRank ";

  // Write code that uses console.log to print the sum of the 'firstInteger' and 'secondInteger' (converted to a Number        type) on a new line.

  // Write code that uses console.log to print the sum of 'firstDecimal' and 'secondDecimal' (converted to a Number            type) on a new line.

  // Write code that uses console.log to print the concatenation of 'firstString' and 'secondString' on a new line. The        variable 'firstString' must be printed first.

  const sumInteger = firstInteger + secondInteger;
  const sumDecimal = firstDecimal + secondDecimal;
  const concatString = firstString + secondString;

  console.log(sumInteger);
  console.log(sumDecimal);
  console.log(concatString);
}

performOperation(12, 4.32, "is the best place to learn and practice coding!");