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JavaScript Generator Communication — exercises and bug fixes

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

    Send a value in

    easy10 min

    Send a name into a paused generator.

  2. 2

    Show the first next only starts it

    easy10 min

    Confirm the value passed to the first call is ignored.

  3. 3

    Build a running total

    easy10 min

    Add several values into a generator one at a time.

  4. 4

    Stop a generator early

    easy10 min

    Call return on a generator and check it reports done.

  5. 5

    Throw into a generator

    medium10 min

    Throw an error into a generator that catches it.

Find the bug(5)

  1. 1

    Fix the value expected on the first call

    easy8 min

    Nothing is paused yet when the first next() runs, so its argument is thrown away.

  2. 2

    Fix the total never sent in

    easy8 min

    Calling next with no argument never advances the running total.

  3. 3

    Fix the generator used after return

    easy8 min

    Once returned, further calls should stay done.

  4. 4

    Fix the throw with no catch inside

    easy8 min

    Without a try block inside, the thrown error escapes the generator entirely instead of being handled.

  5. 5

    Fix while true assumed to hang

    easy8 min

    A while true loop inside a generator is safe, since yield pauses it — capping it out of caution breaks the sequence early.

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