Variable not defined within loop, result may be affected

As a JavaScript beginner, I'm puzzled about why the first loop result shows an "undefined" variable while the rest include "bottles." The goal is to output a statement from 99 to 1.

Below is a snippet of the code:

/*
 * Programming Quiz: 99 Bottles of Juice (4-2)
 *
 * Use the following `while` loop to write out the song "99 bottles of juice".
 * Log your lyrics to the console.
 *
 * Note
 *   - Each line of the lyrics needs to be logged on the same line.
 *   - The pluralization of the word "bottle" changes from "2 bottles" to "1 bottle" to "0 bottles".
 */

var num = 99;
let statementSplit = ((num + " " + bottles + " of juice on the wall! " + num + " " + bottles + " of juice! Take one down, pass it around... "));
while (num > 0) {
  var bottles = (num > 1 ? "bottles" : "bottle");
  statementSplit += ((num + " " + bottles + " of juice on the wall! " + num + " " + bottles + " of juice! Take one down, pass it around... "));
  // var statementSplit=((num+" "+bottles+" of juice on the wall! " + num + " "+ bottles+" of juice! Take one down, pass it around... "));
  num = num - 1;
}
console.log(statementSplit);

Answer №1

The containers are missing double quotes in the initial call of your let statementSplit... line. The correct version should be:

let statementSplit = ((num + " containers of liquid on the shelf! " + num + " containers of liquid! Grab one, share it around... "));

Answer №2

Give it a try with the revised snippet. Ensure that the bottles are included as a string right from the start, not as a variable.

/*
 * Take on this Programming Quiz: 99 Bottles of Juice (4-2)
 *
 * Utilize the provided `while` loop to generate the classic tune "99 bottles of juice".
 * Output your lyrics to the console.
 *
 * Note:
 *   - Each line of the song should be printed on the same line.
 *   - The wording for "bottle" changes based on quantity ("2 bottles", "1 bottle", "0 bottles").
 */

var num = 99;
let statementSplit = ((num + " bottles of juice on the wall! " + num + " bottles of juice! Take one down, pass it around... "));
while (num > 0) {
  var bottles = (num > 1 ? "bottles" : "bottle");
  statementSplit += ((num + " " + bottles + " of juice on the wall! " + num + " " + bottles + " of juice! Take one down, pass it around... "));
  // var statementSplit=((num+" "+bottles+" of juice on the wall! " + num + " "+ bottles+" of juice! Take one down, pass it around... "));
  num = num - 1;
}
console.log(statementSplit);

Answer №3

It has been pointed out by others that there is an undefined variable in the initial statementSplit assignment. To improve maintainability, I suggest moving the first statementSplit assignment inside the while loop where it belongs:

var num = 99;
let statementSplit = "";
while (num > 0) {
    var bottles = (num > 1 ? "bottles" : "bottle");
    statementSplit += ((num + " " + bottles + " of juice on the wall! " + num + " " + bottles + " of juice! Take one down, pass it around... "));
    num = num - 1;
}
console.log(statementSplit);

Answer №4

Swap out the keyword "let" for "var" in JavaScript code to enable hoisting.

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