Practice: Basic Class Syntax

In this exercise, you will be creating a class by creating a constructor and defining static and instance methods.

Set up

Clone the starter from the Download link at the bottom of this page.

Run npm install to install any dependencies.

Directions

Implement the following in the classes/person.js file.

Create a class Person that has the following:

1. instance variables that include firstName, lastName, and age

2. an instance method called introduce that will introduce the person by using console.log with a string saying, "Hi, I'm <firstName> <lastName>, and I'm <age> years old.".

3. a static method called introducePeople that will take in an array of Person instances.

   Have introducePeople throw an Error with a message of "introducePeople only takes an array as an argument." if the argument is not of type Array.

   Have introducePeople throw an Error with a message of "All items in array must be Person class instances." if any of the items in the array are not instances of the Person class.

   If no Errors are thrown then introducePeople should call introduce on each of the People instances in the input array.

Tip: We'll dive into Errors in more detail later. For now, just know that an Error is also a Class, and when you throw a new error the first argument will be that error's message. Use MDN's Error Examples and Error Constructor to help you out if you're stuck.

Run the test specs in the test/person-spec.js file to test that you have created the Person class correctly:

npm test