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# Changelog of the functional-programming course
## 2025-04-08
**functors.py**
* restructure the notebook
* replace `f` in the function signatures with `g` to indicate regular functions and distinguish from functors
## 2025-04-02
**functors.py**
+ Migrate to `python3.13`
+ Replace all occurrences of
```python
class Functor(Generic[A])
```
with
```python
class Functor[A]
```
for conciseness
+ Use `fa` in function signatures instead of `a` when `fa` is a *Functor*
## 2025-03-11
* Demo version of notebook `05_functors.py`
## 2025-03-13
* `0.1.0` version of notebook `05_functors`
Thank [Akshay](https://github.com/akshayka) and [Haleshot](https://github.com/Haleshot) for reviewing
## 2025-03-16
+ Use uppercased letters for `Generic` types, e.g. `A = TypeVar("A")`
+ Refactor the `Functor` class, changing `fmap` and utility methods to `classmethod`
For example:
```python
@dataclass
class Wrapper(Functor, Generic[A]):
value: A
@classmethod
def fmap(cls, f: Callable[[A], B], a: "Wrapper[A]") -> "Wrapper[B]":
return Wrapper(f(a.value))
>>> Wrapper.fmap(lambda x: x + 1, wrapper)
Wrapper(value=2)
```
+ Move the `check_functor_law` method from `Functor` class to a standard function
- Rename `ListWrapper` to `List` for simplicity
- Remove the `Just` class
+ Rewrite proofs
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