@cairdcoinheringaahing Can i learn jelly?

@cairdcoinheringaahing I have trouble learning jelly

@Fmbalbuena What are you struggling with?

Is there an ambivalent function?

What's an ambivalent function?

Ambivalent is a function that executes a dyadic function of there is left argument, else monadic function.

Is that based on APL?

Yes

So, the way Jelly parses its programs are different to the way APL parses them. The way the links are parsed depends on whether 1 or 2 arguments are provided

Each command has a fixed arity, so d is always dyadic, H is always monadic etc.

So the concept of a function switching between dyadic and monadic doesn't exist in Jelly

@cairdcoinheringaahing +5 doesn't error?

And what ++5 will do?

Depends. If given one argument x, it'll do (x+x)+5 = 2x+5 and if given 2 arguments x, y, it does x+y+5

@cairdcoinheringaahing what ++5 without arguments will do?

Have you tried running it in TIO?

@user yeah, but i don't understand why outputs 5

Oh, you want to know why

yes

it is a niladic chain, and since it does not start with a nilad, it is evaluated as a monadic chain on 0

the first + is evaluated as dyad on its own and does (val) + (larg) which is 0 + 0 = 0

then, the second + is paired with the nilad 5 which does (val) + 5 which is 0 + 5 = 5

what about “he“+“llo“?

That outputs he+llo

Why?

Strings are terminated by ”

because your quotes are facing the wrong way

so it's actually ["he", "+", "llo", ""]

but jelly smash-prints that into one string when outputting

They start with “ and end with ”

hlelo?

why?

because + is addition not concatenation

and addition vectorizes

i mean what happens if you use + for strings?

so it's ["hl", "el", "o"] which is printed as "hlelo"

Concatenation, but also undefined behaviour

@Fmbalbuena it vectorizes and adds the characters together

in jelly, strings are meant to be lists of single characters

notice that if you do “he”+“llo” and then put L after it (length), you get 3, not 5

@hyper-neutrino That'd be expected. If you do L€ tho, you'd expect [2,2,1], but you'll get [1,1,1]

... what

Strings are weird when you make them Python strings

Is there a function that does R but [0, 1 ... z]

Try it online!

@Fmbalbuena Ż if z is a number

if z is a list and you want it to vectorise, it gets more complicated

Differences between ØY and ØC?

ØC has Y and y, ØY doesn't

@cairdcoinheringaahing A jelly challenge?

? what do you mean?

@cairdcoinheringaahing a challenge?

As in, do you want me to post a challenge?

I'd suggest trying these or these

@cairdcoinheringaahing Lynn challenges? I only can do the first task.

@Fmbalbuena Take a look at #2 of Lynn's challenges. What does each element of the output look like?

@cairdcoinheringaahing I still can't do.

@Fmbalbuena In which case, try to get the output without limiting yourself to 3 bytes. Then, try and golf it

@cairdcoinheringaahing 3RR’ and idk how to golf

@Fmbalbuena Take a look at the range builtins, and see if you can shorten R’

3RḶ

Very nice :)

I would recommend trying each of Lynn's challenges, ignoring the 3 byte limit, then golfing them down afterwards

3R_ I have no idea why reutrns [-2, -1, 0]

So, in that case, 3 is chopped of the start, as its a "leading nilad", and R_ is run with 3 on both the left and the right

R generates [1, 2, 3], then _ subtracts the right argument (3) from each

@cairdcoinheringaahing Is there a way to fix?

Fix whatt?

Try it online!

¢ is a nilad, you want Ç

Sorry Try it online!

can you put code to subtract 1

_1 will subtract 1, but you can use ’

sorry, i forgot to change _ to ’

Task 20: Try it online!

Nice. I think there's a lot of different ways to get 20

I have Try it online!

> ọ Order, multiplicity, valuation; how many times is x divisible by y?

For 0, that's inf

Task 8: Try it online!

@cairdcoinheringaahing or more to the point, it's unexpected if you expect + to concatenate jelly strings, and expected if you expect it to vectorize over jelly lists and act on their non-list elements--in this case python strings

and then ofc that is still fucky with the length example because length will give 1 for anything that isn't a jelly list, even a non-singleton python string

@cairdcoinheringaahing and mine is also something completely different

@UnrelatedString maybe