Challenge - Complete the bank project functionality

  • 12 minutes

You have a program that's working with some basic features. However, one feature is missing: the ability to transfer money to another account. This challenge consists of adding that functionality plus another feature that we think will add value to our existing API.

Implement the transfer method

To create the transfer method, you should keep these points in mind:

  • You need to implement the ability to transfer money to another account. In this case, you have to initialize the program with at least two accounts and not just one, as we did previously.
  • Because you're going to add a new method in the core package, start by creating the test case to make sure you write the proper logic to transfer money. Pay close attention to how you communicate between functions and pointers.
  • Your transfer method should receive the amount of money that you want to transfer and an account object where you'll add the funds. Ensure that you reuse the deposit and withdraw methods to avoid repetition (especially for the error handling).
  • Remember that you can't transfer money to another account if you don't have enough funds.

Modify the statement endpoint to return a JSON object

Currently, your /statement endpoint returns a string that won't be useful if you want to expose it as an API. Modify the endpoint to return the account object in a JSON format:

"{\"Name\":\"John\",\"Address\":\"Los Angeles, California\",\"Phone\":\"(213) 555 0147\",\"Number\":1001,\"Balance\":0}"

We'd like you to assume that anyone who uses your core package might want to implement a different statement method to change the output. So you need to make the proper changes to make your core package extensible. In other words, you need to:

  1. Create an interface with a Statement() string function.

  2. Create a new Statement() function in your core package that receives the interface that you created as a parameter. This function should call the Statement() method that your structures already have.

    When you make these changes, you'll be allowed to create your custom Account structure and your custom Statement() method. To remember how to make these coding changes, you can go back to the module about structures (embedding) and interfaces.

Happy coding!