Use call — practice exercise

What you'll be asked to do

1. 1.Use callexercise · easy · 10 min

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

   Passes when: #out should show Hello Ada.

2. 2.Pass arguments with callexercise · easy · 10 min · practice plan

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

   Passes when: #out should show Ada in London.

3. 3.Use applyexercise · easy · 10 min · practice plan

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

   Passes when: #out should show Ada in Paris.

4. 4.Use bindexercise · easy · 10 min · practice plan

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

   Passes when: #out should show Hello Grace.

5. 5.Borrow a methodexercise · medium · 10 min · practice plan

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

   Passes when: #out should show Ada,Grace.

6. 6.Fix the missing this valuebug fix · easy · 8 min

   Calling the function directly loses the object.

   Passes when: #out should show Hello Ada.

7. 7.Fix apply given loose argumentsbug fix · easy · 8 min · practice plan

   apply needs its arguments inside an array.

   Passes when: #out should show Ada in Paris.

8. 8.Fix bind used like callbug fix · easy · 8 min · practice plan

   bind returns a function; it does not run it.

   Passes when: #out should show Hello Grace.

9. 9.Fix the argument in the wrong placebug fix · easy · 8 min · practice plan

   With call, this comes first and the arguments follow.

   Passes when: #out should show Ada in London.

10. 10.Fix the same object used twicebug fix · easy · 8 min · practice plan

    Both calls borrow the method with the same object.

    Passes when: #out should show Ada,Grace.

Between them these tasks cover call, apply and bind.

Looking for a different chapter? See every practice set, or switch to the interview theory questions.