Classes and functions pure functions and modifiers

sure! let's discuss classes, functions, pure functions, modifiers, and provide code examples for better understanding.

### classes and functions:

- **classes**: classes are a blueprint for creating objects. they encapsulate data (attributes) and functions (methods) that operate on that data.

- **functions**: functions are blocks of code that perform a specific task when called. they can take input parameters and return output.

### pure functions:

- **pure functions**: pure functions are functions that do not cause any side effects and always return the same output for the same input. they only depend on their input parameters and do not modify any external state.

example of a pure function:

### modifiers:

- **modifiers**: modifiers are functions that perform actions that change the internal state of an object or modify external state.

example of a modifier function:

### code example:

here is a sample code that demonstrates the concepts of pure functions and modifiers using python:

in this code example, we have a pure function `add` in the `calculator` class and a modifier `increment` method in the `counter` class. we also have a `reset_counter` modifier function that resets the count value of a `counter` object.

i hope this tutorial helps you understand the concepts of classes, functions, pure functions, and modifiers. let me know if you have any questions or need further clarification!

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