Hackerrank: Using readLine() to read a stream from STDIN

stdin-stream.js

// Declare second integer, double, and String variables.
    var i2;
    var d2;
    var s2;
    
    // Read and save an integer, double, and String to your variables.

    /* The parseInt() function parses a string argument and returns an integer of the specified radix 
    (the base in mathematical numeral systems).*/
    i2 = parseInt(readLine());

    /* The parseFloat() function parses an argument and returns a floating point number. */
    d2 = parseFloat(readLine());

    /* readLine() allows reading of a stream (such as STDIN) on a line-by-line basis. */
    s2 = readLine();

    // Print the sum of both integer variables on a new line.
    console.log(i + i2);
    // Print the sum of the double variables on a new line.
    console.log((d + d2).toFixed(1));
    // Concatenate and print the String variables on a new line
    // The 's' variable above should be printed first.
    console.log(s + s2);