algorithms

What about create a design pattern directory with the most popular design patterns examples?
We can create some rules like: have to be an explanation about the design pattern, the structure and one real world example.
The directory can be:

(folder) Design Patterns
-- (folder) Abstract Factory
-- -- AbstractFactory.js
-- -- AbstractFactoryTest.js
-- -- REAME.md

I can send some :

Hi!

This line requires the length of bands to be even:

https://github.com/scipy/scipy/blob/b5d8bab88af61d61de09641243848df63380a67f/scipy/signal/_fir_filter_design.py#L982

But from the docs, and the example that uses a flattened sequence as bands (see below), it's not that obvious that firls requires an even number of edges. Could this be improved/clarified in the docs? Thank you!

Typo under the description: Returns a containing. Returns a what?

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