Just a reminder that RacketCon already started: https://www.youtube.com/watch?v=xSjk2PdQm5k

Excellent image and sound! Thanks to the responsible.

agreed! Really impressed! Especially after last year

Incredible upgrade from last year. Thumbs up!

Who’s behind the video/music this year? Please show yourself so you can be properly hailed as a hero! :smile:

I believe it’s professional staff from the SLC library this year

excellent choice to hire professionals - much appreciated!

missed the part when the lunch break ends

is it in 2 hours?

Yes

We are about to start again

is there anyone at racketcon who can explain to me how to use :do-in?

If you use let*, you can avoid the need for set!. Mutation generally causes Racket to produce slower code.

I have used it, but I have to read the docs carefully every time.

Don’t know if it is helpful at all - but the for-loops were inspired by the eager comprehensions in srfi–42. The idea is that all for-loops expand into a loop what has the same shape. That is one must think in terms of the expansion of :do-in.

A few examples of using :do from srfi–42 (which is very similar to :do-in) can be found here (scroll down to “The simple :do loop”):

http://www.scheme.dk/blog/2006/08/eager-comprehensions-for-black-belts-4.html

Thanks! That sounds like a perfect resource for this

@me1531 message received :grinning: