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JavaScript this Keyword — exercises and bug fixes

5 hands-on exercises and 5 find-the-bug challenges for the JavaScript this Keyword 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 this in a method

    easy10 min

    Return a greeting using this.name from an object method.

  2. 2

    this is the object before the dot

    easy10 min

    Return a description using this.brand.

  3. 3

    Keep this with bind

    easy10 min

    Bind a method to its object and call it from a separate variable.

  4. 4

    An arrow keeps the outer this

    easy10 min

    Use an arrow inside a method so it can still see the object.

  5. 5

    this in a class

    medium10 min

    Create a class with a speak method and show what one instance says.

Find the bug(5)

  1. 1

    Fix the missing this

    easy8 min

    The method reads a name that does not exist in its scope.

  2. 2

    Fix the method that lost its object

    easy8 min

    Taking the method out of the object breaks the link to this.

  3. 3

    Fix bind that was never called

    easy8 min

    bind returns a function; it does not run it.

  4. 4

    Fix the normal function inside map

    easy8 min

    A normal callback has its own this, so the team name is lost.

  5. 5

    Fix the class field never set

    easy8 min

    The constructor does not store the name on the instance.

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