gloreea / lab-create-your-own-js-class

repofied version of the gitbook JS classes lab

Lab: Create Your Own JavaScript Class

To practice OOP in JavaScript, we are going to be making a bank account class!

Getting started

• fork and clone this repo to your local machine, then cd into the cloned directory
• open index.html in your browser and use the browser's console to complete this lab
• bank-class.js is already linked up to index.html and ready to use

Bank Account Class

You should use the class keyword to create a BankAccount class. Here are the implementaion details for your BankAccount class:

• Bank accounts should be created with an accountType property (like "savings" or "checking").
• Bank accounts should have a class-level (static) variable tracking the total amount of money in all accounts.
• Each account should keep track of it's current balance.
• Each account should have access to a deposit and a withdraw method.
  • The deposit method should add a specified amount to the account's balance.
  • The withdraw method should subtract a specified amount to the account's balance.
• Each account should start with a balance set to zero.

Use the new keyword to create an instance of your bank account class and test it with console.log() in your browser as you work.

Things to think about

• Any starting values for variables should be set in the constructor method
• Static variables are declared using the static keyword inside the class but outside any methods
• Instance variables are declared inside the constructor method
• Does your constructor method need to accept any parameters?

Stretch Goals

• Start each account with an additional overdraftFees property that starts at zero. If a call to withdraw ends with the balance below zero then overdraftFees should be incremented by twenty.
• Create a ChildBankAccount class that overrides the withdraw method to eliminate the overdraft penalty fee and simply disallow the withdrawal if there aren't enough funds.