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Brad Compton (he/him)
@Bradcomp
Well, until S.concat is a thing
Keith Alexander
@kwijibo
I was wondering what would happen if you concat'd Just(1) with Nothing()
Just, Nothing, or "who knows"
David Chambers
@davidchambers
S.concat actually already exists, @Bradcomp, but as you say the other FL functions are coming soon!
Brad Compton (he/him)
@Bradcomp
Sorry!
David Chambers
@davidchambers
Just(1) specifically, @kwijibo, or are you wondering what happens when one concats just and nothing in general?
No problem, @Bradcomp. I'm itching to get all these pull requests finished. I'm close. I'm also trying to sort out a work permit in Berlin, and I don't know any German yet. My plan to work full-time on Sanctuary is being undermined by bureaucracy. :scream:
Brad Compton (he/him)
@Bradcomp
That's exciting! I would love to see all that stuff merged as well.
Keith Alexander
@kwijibo
S.Nothing().concat(S.Nothing()) //=> S.Nothing() <-- that's nice :)
David Chambers
@davidchambers
:)
Keith Alexander
@kwijibo
@davidchambers I was just wondering if it would be like true || false
David Chambers
@davidchambers
In what sense?
Keith Alexander
@kwijibo
that || is a type of combining, for booleans, and concat is a method for combining values
but there are other ways of combining booleans of course
David Chambers
@davidchambers
You may also be interested in S.or.
Keith Alexander
@kwijibo
yeah that was probably what made me think about it
(so what does it mean to concat them?)
David Chambers
@davidchambers
I can imagine wanting to do something like this:
@ram-bot
R.reduce(S.concat, S.Nothing(), [S.Just('foo'), S.Nothing(), S.Just('baz'), S.Just('quux')])
ram-bot
@ram-bot
Cannot read property '@@transducer/step' of undefined
David Chambers
@davidchambers
That should evaluate to Just('foobazquux').
Brad Compton (he/him)
@Bradcomp
I see! Using lift2(concat) instead resolves to Nothing()
David Chambers
@davidchambers
Ah, good point!
Keith Alexander
@kwijibo
Interesting :)
Irakli Safareli
@safareli
David Chambers
@davidchambers

I understand these:

Identity.empty.concat(Identity([]));  // => Identity([])
Identity([]).concat(Identity.empty);  // => Identity([])

I'm confused by these:

empty.concat(Identity([]));  // => Identity([])
Identity([]).concat(empty);  // => Identity([])
Irakli Safareli
@safareli
// f :: (Monoid m, Applicative m) => Number -> m Number
const f = a == 0 ? empty : of(2)

Then if we use this f and concat some other (Applicative m, Monoid m) => m to it than the result should be this other thing

f(0).concat(Identity([])) // Identity([])

empty represents empty for any monoid

David Chambers
@davidchambers
Oh, I see now.
If we have the special empty value and we want to get an actual empty value, how would we do so? How would we get from empty to '', for example?
Irakli Safareli
@safareli
empty.concat(String.empty)
and that concat on empty is just id so it returns String.empty
David Chambers
@davidchambers
That makes sense.
Irakli Safareli
@safareli
:tada:
David Chambers
@davidchambers
Very cool stuff, @safareli!
Irakli Safareli
@safareli
yeh I'm excited! This weekend I would set up a repo for that, but first i should thinking on the name :smile:
David Chambers
@davidchambers
That's often the trickiest part.
Irakli Safareli
@safareli
here is wip implementation of that empty|of safareli/quasi#1
Wellington Mendoza
@well1791
Hi there!
David Chambers
@davidchambers
Hello!
Wellington Mendoza
@well1791
hey @davidchambers !! I'm here just to learn about great minds!! but also I want to do a presentation for my teammates to use sanctuary and.. If it's ok I would like to ask some questions! being this the first one: what are the major benefits of using sanctuary instead of something like purescript/elm or alikes??
the first thing I'll say is that when you use something like purescript it's a bit hard to mix some libraries..
but still not sure.. I haven't played with purescript or elm before.. so that's why I'm asking here.. ^^
David Chambers
@davidchambers
If using PureScript or Elm is an option, that's the way to go. Sanctuary may be useful for existing JavaScript projects, though, and for other situations where using a "new" language is not an option for some reason or another.
Brad Compton (he/him)
@Bradcomp
For me one benefit is that Sanctuary is still JavaScript. This means you have better interop with the rest of the JS community, and less buy in from the rest of the team.
:point_up:
It's often not reasonable to switch to a pure FP language for one reason or another, as much as we would like to.
David Chambers
@davidchambers
Well put, @Bradcomp. Another way to think about Sanctuary is as a stepping stone. One isn't going to go from writing imperative JavaScript to writing Haskell overnight. Underscore, Ramda, and Sanctuary make such a transition possible over months or years.
Wellington Mendoza
@well1791
@davidchambers @Bradcomp thanks for your responses!! actually that's a good reason to choose sanctuary! thanks for your time guys! you're awesome!
David Chambers
@davidchambers
You're welcome. :)