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JavaScript sessionStorage — exercises and bug fixes

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

    Save and read

    easy10 min

    Save a step number and read it back.

  2. 2

    Store form progress

    easy10 min

    Save an object as JSON for a form step.

  3. 3

    Remove a session value

    easy10 min

    Set and then remove a key, and report it is gone.

  4. 4

    Store a count as text

    easy10 min

    Show that a stored number comes back as a string.

  5. 5

    Use both storages together

    medium10 min

    Save one value in each and read both back.

Find the bug(5)

  1. 1

    Fix localStorage used for temporary data

    easy8 min

    Data that should not outlive the tab belongs in sessionStorage, not localStorage.

  2. 2

    Fix the object saved without stringify

    easy8 min

    Without JSON.stringify the object becomes useless text.

  3. 3

    Fix the stored count added like a number

    easy8 min

    The stored value is text, so plus joins instead of adding.

  4. 4

    Fix the wrong storage read back

    easy8 min

    The value was saved in one storage and read from the other.

  5. 5

    Fix removeItem given the wrong key

    easy8 min

    The key passed to removeItem must match exactly.

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