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JavaScript for of Loop — exercises and bug fixes

5 hands-on exercises and 5 find-the-bug challenges for the JavaScript for of Loop lesson. Every one is checked automatically in the browser — write the code, run it, and the tests tell you what still fails.

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Exercises(5)

  1. 1

    Add up an array

    easy10 min

    Add every number in the array together and show the total.

  2. 2

    Join the values

    easy10 min

    Join the fruit names together with a comma.

  3. 3

    Count the letters

    easy10 min

    Count how many characters are in the text, ignoring spaces.

  4. 4

    Use the index with entries

    easy10 min

    Show each fruit with its index, joined by commas.

  5. 5

    Find the largest number

    medium10 min

    Find the largest number in the array and show it.

Find the bug(5)

  1. 1

    Fix for in used instead of for of

    easy8 min

    for in gives the index, so the totals are wrong.

  2. 2

    Fix the index treated as a value

    easy8 min

    This joins the indexes instead of the fruit names.

  3. 3

    Fix the missing entries call

    easy8 min

    Without entries there is no index to unpack.

  4. 4

    Fix the comparison that never updates

    easy8 min

    The comparison is the wrong way round, so the smallest wins.

  5. 5

    Fix the break that should be continue

    easy8 min

    The loop stops at the first space instead of skipping it.

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