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JavaScript Array some and every — exercises and bug fixes

5 hands-on exercises and 5 find-the-bug challenges for the JavaScript Array some and every 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

    Check for any match

    easy10 min

    Use some to check whether any number is above five.

  2. 2

    Check they all match

    easy10 min

    Use every to check whether all numbers are above five.

  3. 3

    Validate a form

    easy10 min

    Check that every field has been filled in.

  4. 4

    Look for a problem

    easy10 min

    Check whether any score is below fifty.

  5. 5

    Test an empty array

    medium10 min

    Show what every gives back for an empty array.

Find the bug(5)

  1. 1

    Fix every used instead of some

    easy8 min

    Only one match is needed, not all of them.

  2. 2

    Fix some used for validation

    easy8 min

    All fields must be filled, not just one of them.

  3. 3

    Fix the missing return

    easy8 min

    Without a return the callback is always undefined, which is falsy.

  4. 4

    Fix filter used for a yes or no

    easy8 min

    A boolean is wanted, not a list of matches.

  5. 5

    Fix the inverted active check

    easy8 min

    The question is whether all users are active, not whether any are.

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