In Gosu, which keyword is used to define a class?

In Gosu, the keyword used to define a class is "class." This keyword initiates the declaration of a new class, allowing developers to encapsulate related data and behavior together. When you use the "class" keyword, you specify the name of the class, which can then contain properties (fields), methods (functions), and other nested classes or interfaces.

Using the "class" keyword is foundational in object-oriented programming and is essential when you want to create instances of that class to utilize in your application. The concept of a class serves as a blueprint for creating objects that hold state and behavior.

The other options do not serve this purpose: "define" is not a keyword in Gosu for defining classes, "function" is typically used to define methods within a class rather than the class itself, and "object" refers to an instance of a class, rather than the class declaration. Therefore, the use of "class" distinctly identifies the structure and composition of an object-oriented entity in Gosu programming.