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JavaScript String Comparison — exercises and bug fixes

5 hands-on exercises and 5 find-the-bug challenges for the JavaScript String Comparison 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

    Compare alphabetically

    easy10 min

    Report whether apple comes before banana.

  2. 2

    Show the case rule

    easy10 min

    Report whether a capital Z sorts before a lowercase a.

  3. 3

    Sort with localeCompare

    easy10 min

    Sort the names the way a person would expect.

  4. 4

    Compare fairly

    easy10 min

    Trim and lowercase before comparing.

  5. 5

    Read what localeCompare returns

    medium10 min

    Report the value when the two strings are identical.

Find the bug(5)

  1. 1

    Fix the default sort

    easy8 min

    The default sort puts capitals before lowercase.

  2. 2

    Fix the untrimmed comparison

    easy8 min

    The stray spaces make the two look different.

  3. 3

    Fix the comparison of lengths

    easy8 min

    Alphabetical order is wanted, not length.

  4. 4

    Fix localeCompare treated as a boolean

    easy8 min

    Any non-zero result is truthy, so the wrong branch runs.

  5. 5

    Fix the sort that changes the original

    easy8 min

    sort works in place, so the original order is lost.

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