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JavaScript == vs === — exercises and bug fixes

5 hands-on exercises and 5 find-the-bug challenges for the JavaScript == vs === 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 loosely

    easy10 min

    Report whether a string and a number are loosely equal.

  2. 2

    Compare strictly

    easy10 min

    Report whether they are strictly equal.

  3. 3

    Check for null or undefined

    easy10 min

    Use one check that catches both.

  4. 4

    Compare two objects

    easy10 min

    Report whether two identical-looking objects are equal.

  5. 5

    Convert then compare

    medium10 min

    Convert the text before comparing it strictly.

Find the bug(5)

  1. 1

    Fix the loose comparison

    easy8 min

    A string and a number should not be treated as equal.

  2. 2

    Fix the object compared by contents

    easy8 min

    Two objects are equal only if they are the same object.

  3. 3

    Fix the strict null check

    easy8 min

    Strict equality misses undefined when checking for null.

  4. 4

    Fix the loose comparison against text

    easy8 min

    The number should not be treated as equal to the string.

  5. 5

    Fix the empty string compared to zero

    easy8 min

    Loose equality says they are equal, which is not wanted.

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