L12: Folding over Lists

[@NedaAbdolrahimi-e1w]

I laughed a lot in the motorcycle part :)))) and learned a lot from the tutorial. Thank you for spending a lot of time on these videos.

[@crfout1]

In the use of the custom fold function, the lambda form is distracting and unnecessary. The custom fold function is already designed to properly use a binary function as an argument.
Instead of:
(fold (lambda (next-element acc) (+ next-element acc)) 0 lst)
Use:
(fold + 0 lst)

[@krismicinski]

@@crfout1 I don’t think it’s much different: one is eta expanded, and it’s not a big insight to say that eta expanding is different. Respectfully: this is just an aesthetic difference, and not as important as you are implying. Eta expansion is discussed later and this example here is used to motivate it

[@crfout1]

@@krismicinski Is teaching unnecessary complexity the right thing to do? Generic styles can be great, but only after the students understand what "folding over a list" actually means. At least explain up front that the much longer and more complicated version has a different purpose.

[@krismicinski]

@@crfout1 thanks for the criticism, it is appreciated as I work on the next iteration of the course

[@crfout1]

@@krismicinski I thoroughly enjoyed the UA-cam accessible portion of your course. Thanks for posting it here!