Write a constructor — practice exercise

What you'll be asked to do

1. 1.Write a constructorexercise · easy · 10 min

   Write a Person constructor and build one with the name Ada.

   Passes when: #out should show Ada.

2. 2.Store two propertiesexercise · easy · 10 min · practice plan

   Build a Car with a brand and year and show both.

   Passes when: #out should show Toyota 2021.

3. 3.Build two separate objectsexercise · easy · 10 min · practice plan

   Build two cars and show that they hold different brands.

   Passes when: #out should show Toyota Honda.

4. 4.Add a prototype methodexercise · easy · 10 min · practice plan

   Put a greet method on the prototype and call it.

   Passes when: #out should show Hi Grace.

5. 5.Use a class insteadexercise · medium · 10 min · practice plan

   Write the same thing as a class and call its method.

   Passes when: #out should show Hey Alan.

6. 6.Fix the missing new keywordbug fix · easy · 8 min

   Without new the constructor builds nothing and returns undefined.

   Passes when: #out should show Ada.

7. 7.Fix the parameter never storedbug fix · easy · 8 min · practice plan

   The constructor takes a name but never puts it on the object.

   Passes when: #out should show Toyota.

8. 8.Fix the shared objectbug fix · easy · 8 min · practice plan

   Returning one fixed object means every car is the same one.

   Passes when: #out should show Toyota Honda.

9. 9.Fix the method on the wrong placebug fix · easy · 8 min · practice plan

   The method was put on the constructor itself, not its prototype.

   Passes when: #out should show Hi Grace.

10. 10.Fix the class constructor named wronglybug fix · easy · 8 min · practice plan

    The setup method must be called constructor.

    Passes when: #out should show Hey Alan.

Between them these tasks cover Constructors, new and Prototypes.

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