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JavaScript call, apply and bind — exercises and bug fixes

5 hands-on exercises and 5 find-the-bug challenges for the JavaScript call, apply and bind 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 call

    easy10 min

    Use call to run a greeting with the person object as this.

  2. 2

    Pass arguments with call

    easy10 min

    Use call to pass a city as well as setting this.

  3. 3

    Use apply

    easy10 min

    Do the same job with apply, passing the arguments as an array.

  4. 4

    Use bind

    easy10 min

    Use bind to make a greeting function that always uses the person object.

  5. 5

    Borrow a method

    medium10 min

    Use call so the same function reports two different names, joined by a comma.

Find the bug(5)

  1. 1

    Fix the missing this value

    easy8 min

    Calling the function directly loses the object.

  2. 2

    Fix apply given loose arguments

    easy8 min

    apply needs its arguments inside an array.

  3. 3

    Fix bind used like call

    easy8 min

    bind returns a function; it does not run it.

  4. 4

    Fix the argument in the wrong place

    easy8 min

    With call, this comes first and the arguments follow.

  5. 5

    Fix the same object used twice

    easy8 min

    Both calls borrow the method with the same object.

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