Hello, Space Explorer! Today, we're delving into an essential topic in Ruby: managing data using arrays.

We’ll practice this by building a simple Student Management System that tracks students and their grades. Using arrays in Ruby, we’ll see how to efficiently organize and access data, just as we might in real-world applications. Ready to dive in? Let’s get started!

To achieve our goal, we’ll need three key methods within our class:

1. add_student(name, grade): Adds a new student and their grade to the list. If the student already exists, their grade will be updated.
2. get_grade(name): Retrieves the grade for a student by their name. If the student isn’t found, it returns nil.
3. remove_student(name): Removes a student from the list by their name. It returns true if the student was successfully removed and false if the student doesn’t exist.

Sound straightforward? Fantastic! Let’s walk through each method step-by-step.

First, we’ll define our StudentManager class, which will use an array to manage students and their grades.