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JavaScript Function Parameters — exercises and bug fixes

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

    Use two parameters

    easy10 min

    Write a function that joins a name and a city with the word from.

  2. 2

    Order matters

    easy10 min

    Call a divide function so it works out 20 divided by 4.

  3. 3

    Handle a missing argument

    easy10 min

    Show the word missing when the second argument is left out.

  4. 4

    Parameters are local

    easy10 min

    Show that changing a parameter does not change the outside variable.

  5. 5

    Objects are shared

    medium10 min

    Change a property inside a function and show the object was really changed.

Find the bug(5)

  1. 1

    Fix the swapped arguments

    easy8 min

    The two values are passed in the wrong order.

  2. 2

    Fix the reversed division

    easy8 min

    The parameters are divided the wrong way round.

  3. 3

    Fix the wrong emptiness check

    easy8 min

    Comparing with null does not catch a missing argument.

  4. 4

    Fix the parameter name typo

    easy8 min

    The body uses a name that does not exist.

  5. 5

    Fix the object that was replaced

    easy8 min

    Replacing the parameter does not change the original object.

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