do block considered harmless | Nicolau Leal Werneck | JuliaCon 2022

[digital-carver]

Link to the talk: https://www.youtube.com/watch?v=2VccdiX-9Tg

---

Pull Requests/Proposals mentioned in the talk:

• Have flatmap out of the box - Implements flatmap JuliaLang/julia#44792
• Unfold() - Unfold() is an iterable based on a transition function JuliaLang/julia#44873
• Iterable alternative for optional types, also futures - A function to convert an optional Union{X,Nothing} to an iterable Union{Tuple{X},Tuple{}} JuliaLang/julia#44864
• Review performance of functional combinators - mapreduce: use simpler reduction order in some cases JuliaLang/julia#45000

do-block section in the Julia manual: https://docs.julialang.org/en/v1/manual/functions/#Do-Block-Syntax-for-Function-Arguments

00:06 Introduction
00:25 Why is do-syntax so cool?
02:24 Why avoid writing for-loops?
04:13 Can it really be done? (Limitations)
05:16 Illustrative example: simple for loop
05:59 Illustrative example: nested for loop
06:41 Proposals
07:26 Conclusion

[digital-carver]

Github auto-converted the plain URLs I posted (as links to the PRs/proposals) into the fancy output above. In case that makes it harder to copy, here's the same list with githubcom instead of github.com (the dot removed) so Github doesn't mess with them:

Pull Requests/Proposals mentioned in the talk:

• Have flatmap out of the box - https://githubcom/JuliaLang/julia/pull/44792
• Unfold() - https://githubcom/JuliaLang/julia/pull/44873
• Iterable alternative for optional types, also futures - https://githubcom/JuliaLang/julia/pull/44864
• Review performance of functional combinators - https://githubcom/JuliaLang/julia/issues/45000

[nlw0]

Hey, thanks for the work!

[digital-carver]

Thanks for the talk! The flexibility and variety of syntax options is one of my favourite things about Julia. It's great to see them explored to their full power.

[KZiemian]

I tweaked materials in this thread a bit.

Contents
00:00 Opening and introduction
00:25 Why is do-syntax so cool?
02:24 Why avoid writing for-loops?
04:13 Can it really be done? Limitations of the approach
05:16 Illustrative example: simple for loop
05:59 Illustrative example: nested for loop
06:41 Proposals
07:26 Conclusion

Resources
Julia manual section on do-block, link.
Pull request Implements flatmap.
Pull request mapreduce: use simpler reduction order in some cases.
Pull request Unfold() is an iterable based on a transition function.

[KZiemian]

Thank you. Timestamps were added to the video, we will close this issue, when we get access rights to this GitHub repository.

[KZiemian]

It looks to me, that we can close the issue.