Write a Hello World! function that can greet someone given their name. The function should return the appropriate greeting.

For an input of "Alice", the response should be "Hello, Alice!".

If a name is not given, the response should be "Hello, World!"

This function will be a class level method on a HelloWorld class. It will be called like this from the tests:

HelloWorld.hello

HelloWorld.hello$(\text{'}$Alice$\text{'})$

Test$-$Driven Development

As programmers mature, they eventually want to test their code.

At Exercism we simulate Test$-$Driven Development $($TDD$),$ where you write your tests before writing any functionality. The simulation comes in the form of a pre$-$written test suite, which will signal that you have solved the problem.

It will also provide you with a safety net to explore other solutions without breaking the functionality.

A typical TDD workflow on Exercism:

Run the test file and pick one test that's failing.

Write some code to fix the test you picked.

Re$-$run the tests to confirm the test is now passing.

Remove "skip" from one of the other included tests.

Repeat from step $1.$