The APL Orchard

Adám

18:00

@Fmbalbuena So, you remember what I told you about monadic and dyadic functions?

Fmbalbuena

@Adám yes but what does this do?

Fawn Locke

I thought the question was other way around? Filter out aka get rid of

Adám

@Fmbalbuena So, if you put ⍨ on the immediate right of a dyadic function, you get a monadic function that uses the same single argument as both arguments. E.g. +⍨10 gives 20 and ×⍨10 gives 100

Paul Mansour

@FawnLocke Indeed, could be read either way!

Fmbalbuena

oh <code>⍨<code2> ¡s <code><code2><code>?

Adám

18:02

No, not exactly, because every APL function takes as right argument, everything to its right.

Fmbalbuena

but why? what is ⍨

Adám

Ah, so ⍨ is a new type of thing you've not seen before. We call it a monadic operator.

Operators are "higher-order" functions. I like to think of them as "function factories".

Fmbalbuena

wdym?

Adám

They take one (in this case) or two parameters we call operands, and create a new derived function.

E.g. ⍨ can take + and creates the "double" function.

⍨ can take × and creates the "square" function.

Btw, you can also use the derived function dyadically. In that case, F⍨ derives a new function which is exactly like the dyadic function F except it takes the arguments in swapped order.

Fmbalbuena

@Adám remove

Adám

18:07

So, e.g. 2-⍨10 is 8 because -⍨ is like - with swapped arguments.

So, we can write (2×⍳10)-1 as 1-⍨2×⍳10

Fmbalbuena

⋄F←×5+⋄⍨F8

TryAPL

@Fmbalbuena
SYNTAX ERROR
      F←×5+ ⋄ ⍨F8
          ∧

Adám

@Fmbalbuena Hold on, you want just F←× no?

Fmbalbuena

@Adám i want F be "* 5 +".

Adám

OK, but then you need how learn how to write a lambda: F←{⍺×5+⍵}

⍺ and ⍵ are the names of the left and right arguments, and the braces mark the function.

Fmbalbuena

18:09

⋄F←{⍺×5+⍵}⋄F⍨8

TryAPL

@Fmbalbuena 104

Adám

@Fmbalbuena You need ⍺ in the spot(s) where you want the left argument inserted.

And ⍵ in the spot(s) where you want the right argument inserted.

Also, it is F⍨ not ⍨F

Fmbalbuena

Yay

Adám

Very nice.

Fmbalbuena

@Adám [?] [⍺] [Function] [⍵] [?] is there a way?

Adám

18:12

I don't know what you're asking.

But considering this new info, what would be the shortest way to generate all squares from 1 to 100?

Fmbalbuena

the left argument of ⍺? and right of ⍵?

Adám

Yes. You omit ⍺ if you're writing a monadic function.

Fmbalbuena

???

wdym?

Adám

Monadic functions only take a right argument. ⍺ is the name of the left argument. Monadic functions don't use a left argument.

Fmbalbuena

Oh but is there a way?

Adám

18:18

@Fmbalbuena Is there a way to do what?

Fmbalbuena

What is APL Campfire?

Adám

@Fmbalbuena apl.wiki/APL_Campfire

Fmbalbuena

how to get the variable X using function F with this simple code X 1 F 1 2

@Adám but what is APL campfire? show short example.

Adám

@Fmbalbuena There are no short examples. Each one is at least an hour long.

@Fmbalbuena F←{⊃⍺}

Fmbalbuena

⋄F←{⊃⍺×⍺×⍵}⋄⎕←2 3 F 5

TryAPL

18:23

@Fmbalbuena 20

Adám

⊃ is just another (monadic) function you've not learned about yet. It is called "First".

Fmbalbuena

⎕←2×3×5

TryAPL

@Fmbalbuena 30

Fmbalbuena

why not working?

Adám

Because every APL function takes as right argument, everything to its right.

hyper-neutrino

18:24

@Adám for fm's example is that first(2 3 × 2 3 × 5) which is first(20, 45)? or am I reading the parsing wrong

Adám

Correct.

Fmbalbuena

i don't understand

Adám

@Fmbalbuena ⊃⍺×⍺×⍵ is ⊃(⍺×⍺×⍵) because the right argument of ⊃ is everything to its right (as it is for all APL functions).

Fmbalbuena

⋄F←{(⊃⍺)×⍺×⍵}⋄⎕←2 3 F 5

TryAPL

@Fmbalbuena 20 30

Fmbalbuena

18:27

why not working?

Adám

What result did you expect?

Fmbalbuena

3 mins ago, by TryAPL

@Fmbalbuena 30

@Adám ^

Adám

But ⍺ is 2 3

Fmbalbuena

oh

⋄F←{(⍺[1])×(⍺[2])×⍵}⋄⎕←2 3 F 5

TryAPL

@Fmbalbuena 30

Fmbalbuena

18:31

Yay

Adám

You don't actually need parentheses there.

Fmbalbuena

⋄F←{⍺[1]×⍺[2]×⍵}⋄⎕←2 3 F 5

TryAPL

@Fmbalbuena 30

Adám

Also, the function ⊃ can actually take a left argument which is the element you want. You could see it as have having a default left argument of 1.

Fmbalbuena

⎕←⊃1 2

TryAPL

18:34

@Fmbalbuena 1

Adám

@Fmbalbuena You don't actually need parenthesis there.

Fmbalbuena

⋄F←{(⊃⍺)×⍺[2]×⍵}⋄⎕←2 3 F 5

TryAPL

@Fmbalbuena 30

Adám

@Fmbalbuena ⊂?

Fmbalbuena

@Adám i guessed i't gets the last element of list.

Adám

18:37

Ah, I see.

⋄ ⎕←2 3 {(⊃⍺)×(2⊃⍺)×⍵} 5

TryAPL

@Adám 30

Fmbalbuena

oh

@Adám you don't need ⋄ at the start

Adám

@Fmbalbuena True.

Fmbalbuena

⎕←2 3{(⊃⍺)×(2⊃⍺)×⍵}5

TryAPL

@Fmbalbuena 30

Fmbalbuena

18:40

⋄)load Arachnid

TryAPL

@Fmbalbuena Invalid system command

Fmbalbuena

⋄)interpret Malbolge?

TryAPL

@Fmbalbuena Invalid system command

Fmbalbuena

why not working?

Adám

Are you serious?

Fmbalbuena

18:41

?

Adám

)load Arachnid isn't working because TryAPL is restricted.

Fmbalbuena

understood

@Adám but how i't works

Adám

)interpret Malbolge isn't working because APL doesn't have an )interpret command.

Fmbalbuena

⎕←⍟9

TryAPL

@Fmbalbuena 2.197224577

Fmbalbuena

18:46

or better ln(9)

Adám

@Fmbalbuena And how would you want to write the 10-logarithm of 9?

Fmbalbuena

@Adám idk

Adám

⋄ 10⍟9

TryAPL

@Adám 0.9542425094

Adám

So ⍟ is an ambivalent function with e as default left argument.

Fmbalbuena

18:49

⎕←0⍟9 errors?

TryAPL

@Fmbalbuena
DOMAIN ERROR
      ⎕←0⍟9
       ∧

Fmbalbuena

@Adám is there a way to print STDERR?

Adám

⍞← instead of ⎕← (but this doesn't work on TryAPL).

Fmbalbuena

But ⍞← prints without a newline

Adám

True, because this allows you to add to a progress report like ........

Fmbalbuena

18:53

i don't understand ⍞← prints without newline or prints to STDERR.

Adám

@user15839551 Hi Toanuvo. If you want to participate here, please email [email protected]

@Fmbalbuena Both. It prints to STDERR without newline.

⎕← prints to STDOUT with newline.

Fmbalbuena

@Adám Print to STDOUT without newline?

Adám

No simple way to do that.

And why would you anyway?

Fmbalbuena

i need to do for some challenges like this.

Adám

@Fmbalbuena Default I/O rules allow STDERR.

Fmbalbuena

18:58

okay but i need for some reason.

Adám

I have yet to see a compelling use case.

(It is possible to do arbitrary output, but it is much more involved.)

Fmbalbuena

@Adám is there a way to do?

Adám

Yes, it is possible to write to STDOUT without a trailing newline, but it is much more involved, and I think you don't need to learn that right now.

Fmbalbuena

ok

print newline to STDERR?

Adám

⍞←⎕UCS 10

Fmbalbuena

19:02

⎕←⎕UCS 33

TryAPL

@Fmbalbuena !

Fmbalbuena

Converts 33 to ASCII char?

Adám

Indeed. Unicode, actually, but that's a superset of ASCII.

Fmbalbuena

⎕←⎕UCS 33

TryAPL

@Fmbalbuena !

Adám

19:03

Btw, it can also convert characters to their code points in the Universal Character Set: ⎕←⎕UCS '@ABC'

TryAPL

@Adám 64 65 66 67

Adám

@Fmbalbuena CMC: Generate all of printable ASCII.

Fmbalbuena

⋄chr←{⎕UCS ⍵}⋄⎕←chr 33

TryAPL

@Fmbalbuena !

Fmbalbuena

@Adám 33-127?

Adám

19:05

Yes, or 32− if you want.

Fmbalbuena

@Adám ⎕←⎕UCS 32+⍳95

TryAPL

@Fmbalbuena !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~

Fmbalbuena

@Adám correct?

⎕←⎕UCS 127+⍳2000

TryAPL

@Fmbalbuena
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    …

Adám

@Fmbalbuena Pretty much. Most people consider space a printable ASCII char but do not consider DEL as printable.

Fmbalbuena

19:10

@Adám DEL is not printable i know

Adám

Well, but 32+95 is 127 which is DEL.

Fmbalbuena

@Adám 128 is DEL

Adám

If so, then I'm mistaken.

Delete character

The delete control character (also called DEL or rubout) is the last character in the ASCII repertoire, with the code 127. It is supposed to do nothing and was designed to erase incorrect characters on paper tape. It is denoted as ^? in caret notation and is U+007F in Unicode. Terminal emulators may produce DEL when ← Backspace key or Control+← Backspace or Control+? are typed. == History == This code was originally used to mark deleted characters on punched tape, since any character could be changed to all ones by punching holes everywhere. If a character was punched erroneously, punching out...

Fmbalbuena

@Adám nope, 128 is Ç

⎕←⎕UCS 32+⍳94

TryAPL

@Fmbalbuena !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~

Adám

19:14

I'd write 31+⍳95 because Wikipedia says:

> There are 95 printable characters in total.

Fmbalbuena

Jo King says newline is not printable then i guess the whitespace is not printable.

bitwise not?

@Adám ^

:59869283 ?

Adám

@Fmbalbuena You'd have to convert to binary, then use ~

Fmbalbuena

@Adám how to convert?

(list)

Adám

How many bits do you want in the representation?

Fmbalbuena

@Adám 00110001 00110110

Wezl - a cautionary tale

19:22

⋄byte←8⍴2 ⋄ byte⊥~byte⊤5 (8-bit bitwise NOT of 5)

TryAPL

@Wezl-acautionarytale 250

Adám

@Fmbalbuena 49 54‽

Anyhow, what Wezl is doing is right for 8-bit representation.

@Fmbalbuena No no, I meant that your answer to my question encodes 49 54, and I didn't understand what you meant by that.

Fmbalbuena

@Adám 16

(Exactly 16 bits)

in ASCII

Adám

ASCII is 7 bits, but whatever.

@Fmbalbuena Then you want (16⍴2)⊤n

Fmbalbuena

⋄MODULOCREATEDBYFMBALBUENASOUSETHISLAMBDAFUNCTIONPLZZZ←{⍵|⍺}⋄⎕←93 MODULOCREATEDBYFMBALBUENASOUSETHISLAMBDAFUNCTIONPLZZZ 6

TryAPL

19:25

@Fmbalbuena 3

Wezl - a cautionary tale

scalar left arg of encode should extend and return a lazy array :)

Fmbalbuena

@Wezl-acautionarytale ?

Adám

@Wezl-acautionarytale Heh. I'd rather it used as many bits as necessary.

Wezl - a cautionary tale

maybe if APL didn't enforce rectangular arrays

Fmbalbuena

@Adám do you like this lambda function?

Adám

19:28

Also, it'd need to be lazy towards the left!

Fmbalbuena

2 mins ago, by Fmbalbuena

⋄MODULOCREATEDBYFMBALBUENASOUSETHISLAMBDAFUNCTIONPLZZZ←{⍵|⍺}⋄⎕←93 MODULOCREATEDBYFMBALBUENASOUSETHISLAMBDAFUNCTIONPLZZZ 6

TryAPL

@Fmbalbuena 3

Wezl - a cautionary tale

@Adám another problem with encode

Adám

Are you saying it should have been little-endian?

Wezl - a cautionary tale

but yeah that would be pretty impossible to use

Adám

19:29

@Fmbalbuena I'm afraid I don't get the joke.

Wezl - a cautionary tale

@Adám sure, little-endian with bit-sized bytes

Adám

;-)

Fmbalbuena

@Adám because 5 mod 3 returns 2 in Other Programming languages but in APL returns 3

Wezl - a cautionary tale

if it's a lazy array, it doesn't matter

lazy arrays can just be functions

Fmbalbuena

@Adám do you understand?

Adám

19:31

@Fmbalbuena Yes, but then it isn't a joke, is it? Dyadic | is division remainder when its right argument is divided by its left argument. It isn't mod of mathematics or other programming languages.

Fmbalbuena

ok

Adám

And while I agree that having swapped arguments would have been most consistent with ÷, by far most uses need a complex expression as the value(s) being divided, and a single number as divisor, so | is easiest to use the way it is. Otherwise, you'd have to write |⍨ all the time.

Fmbalbuena

CMC: Quine but only if i understand

Wezl - a cautionary tale

⋄1

TryAPL

@Wezl-acautionarytale 1

Wezl - a cautionary tale

19:33

not a real quine, but I think you understand it ;)

Fmbalbuena

@Wezl-acautionarytale lol i don't know implicit print.

Adám

@Fmbalbuena I just need to teach you two more functions.

Fmbalbuena

@Adám yes teach me

Adám

OK, so one is what you just saw Wezl use: Dyadic ⍴

It takes a shape on the left and data one the right.

Then it reshapes the data into the given shape.

If there isn't enough data, it recycles the data: ⋄ 5⍴1 2 3 4

TryAPL

@Adám 1 2 3 4 1

Adám

19:35

⋄ 10⍴0 1

TryAPL

@Adám 0 1 0 1 0 1 0 1 0 1

Adám

⋄ 6⍴'Hello'

TryAPL

@Adám HelloH

Fmbalbuena

~~i don't understand what is ⍴~~ understood

Adám

If there's too much data, ⍴ discards the excess: ⋄ 2⍴'Hello'

TryAPL

19:36

@Adám He

Fmbalbuena

⋄2⍴''''

TryAPL

@Fmbalbuena ''

Adám

Aha! Now you begin to see how you could construct a quine.

Wezl - a cautionary tale

⋄ ⍴⍨⍳3

TryAPL

@Wezl-acautionarytale
1 2 3
1 2 3

Adám

19:37

We've not learned about multi-dimensional arrays yet, so that result will be strange to you.

Fmbalbuena

join strings?

Adám

Dyadic ,

But we don't need that for our quine.

Fmbalbuena

⋄',4⍴',4⍴''''

TryAPL

@Fmbalbuena ,4⍴''''

Fmbalbuena

almost quine

Adám

19:40

Indeed.

Let me teach you one more function: Dyadic ⌽

Fmbalbuena

what i't does?

Adám

It takes a number on the left, and any array on the right, and rotates the left number elements from the beginning to the end.

E.g. ⋄ 1⌽'Hello'

TryAPL

@Adám elloH

Adám

⋄ 3⍉⍳10

TryAPL

@Adám
RANK ERROR
      3⍉⍳10
       ∧

Fmbalbuena

19:41

@Adám lol wrong char

Adám

Yup.

Fmbalbuena

understood

hyper-neutrino

there's no reason to delete aplbot commands unless it was a mistake or is taking up a lot of unnecessary space

Fmbalbuena

@hyper-neutrino wdym?

@Adám write quine

hyper-neutrino

you ran the rotate command and then deleted it once the result returned; there's no reason to do that

Adám

19:45

@Fmbalbuena ⋄ 1⌽22⍴11⍴'''1⌽22⍴11⍴'''

TryAPL

@Adám 1⌽22⍴11⍴'''1⌽22⍴11⍴'''

Adám

You should be able to understand this.

hyper-neutrino

is this the shortest apl quine or just a simple one?

Fmbalbuena

@Adám wait

Adám

@hyper-neutrino Simple.

Fmbalbuena

19:46

1⌽22⍴11⍴'''1⌽22⍴11⍴'''

1⌽22⍴'''1⌽22⍴11⍴'''''

1⌽'''1⌽22⍴11⍴''''''1⌽22⍴11⍴'''''

'''⍴1⌽22⍴11⍴''''''1⌽22⍴11'''''

out: '⍴1⌽22⍴11⍴'''1⌽22⍴11''

@Adám can you find bugs?

Adám

@Fmbalbuena This should be '1⌽22⍴11⍴''''''1⌽22⍴11⍴''''''' because ⌽ rotates the leading ' to the end.

Fmbalbuena

'1⌽22⍴11⍴''''''1⌽22⍴11⍴'''''''

out: 1⌽22⍴11⍴'''1⌽22⍴11⍴'''

but why this is quine?

Adám

Because it is an expression that results in itself.

Fmbalbuena

@Adám ?

Adám

Quine (computing)

A quine is a computer program which takes no input and produces a copy of its own source code as its only output. The standard terms for these programs in the computability theory and computer science literature are "self-replicating programs", "self-reproducing programs", and "self-copying programs". A quine is a fixed point of an execution environment, when the execution environment is viewed as a function transforming programs into their outputs. Quines are possible in any Turing-complete programming language, as a direct consequence of Kleene's recursion theorem. For amusement, programmers...

Fmbalbuena

19:54

i know what is quine but why this prints the source code?

Adám

Well, you just went though it step-by-step and found that it does, no?

Fmbalbuena

but how do you got that?

Adám

You mean to ask where I got that quine from?

Fmbalbuena

no, explain why?

Adám

Because, when evaluated according to the meanings and rules of APL, it returns a text which is identical to itself.

Fmbalbuena

19:58

but i don't understand

aplwiki.com/wiki/Quine

'''1⌽,⍨9⍴''' the characters '1⌽,⍨9⍴'
9⍴ reshape to shape 9, resulting in '1⌽,⍨9⍴''
,⍨ concatenate with itself, resulting in '1⌽,⍨9⍴'''1⌽,⍨9⍴''
1⌽ rotate one character to the left, getting the characters: 1⌽,⍨9⍴'''1⌽,⍨9⍴'''

Adám

@Fmbalbuena Do you understand why 11⍴'''1⌽22⍴11⍴''' gives '''1⌽22⍴11⍴'''''?

Fmbalbuena

@Adám yes

Adám

@Fmbalbuena Do you understand why 22⍴11⍴'''1⌽22⍴11⍴''' gives '''1⌽22⍴11⍴''''''1⌽22⍴11⍴'''''?

(That was to a different question.)

Do you understand why 1⌽22⍴11⍴'''1⌽22⍴11⍴''' gives '1⌽22⍴11⍴''''''1⌽22⍴11⍴'''''''?

hyper-neutrino

why does it rotate two '?

Fmbalbuena

@Adám no

hyper-neutrino

20:01

oh, wait, are you providing the expression that's returned instead of the raw string itself as it would be printed

Adám

Yeah.

hyper-neutrino

ah. that makes sense

Adám

@Fmbalbuena Do you understand how dyadic ⍴ works?

Fmbalbuena

yes but why gives?

Adám

You removed your answer above, so I'll ask again: Do you understand why 22⍴11⍴'''1⌽22⍴11⍴''' gives '''1⌽22⍴11⍴''''''1⌽22⍴11⍴'''''?

Fmbalbuena

20:03

no

Adám

@Fmbalbuena Wait, you didn't understand that?

Note that I'm writing equivalent expressions, not raw strings.

Fmbalbuena

i need understand why 1⌽22⍴11⍴'''1⌽22⍴11⍴''' gives 1⌽22⍴11⍴'''1⌽22⍴11⍴'''.

Adám

Yes. Let's do it step-by-step.

So, you understand how 11⍴'''1⌽22⍴11⍴''' and '''1⌽22⍴11⍴''''' are equivalent expressions, i.e. they give the same result?

Fmbalbuena

@Adám yes

but please do step-by-step without asking questions

Adám

No problem.

11⍴'''1⌽22⍴11⍴''' → '''1⌽22⍴11⍴''''' which prints as '1⌽22⍴11⍴''
22⍴11⍴'''1⌽22⍴11⍴''' → 22⍴'''1⌽22⍴11⍴''''' → '''1⌽22⍴11⍴''''''1⌽22⍴11⍴''''' which prints as '1⌽22⍴11⍴'''1⌽22⍴11⍴''
1⌽22⍴11⍴'''1⌽22⍴11⍴''' → 1⌽22⍴'''1⌽22⍴11⍴''''' → 1⌽'''1⌽22⍴11⍴''''''1⌽22⍴11⍴''''' → '1⌽22⍴11⍴''''''1⌽22⍴11⍴''''''' which prints as 1⌽22⍴11⍴'''1⌽22⍴11⍴'''

Fmbalbuena

20:10

ok

Adám

So you understand now?

Fmbalbuena

22:07

@Adám yes

Adám

Great. You should be able to figure understand the shorter quine too now too.

Fmbalbuena

can we define one line function using ⋄?

@Adám ^

Adám

Yes. E.g. ⋄ F←{double←2×⍵ ⋄ double,double} ⋄ F 10

TryAPL

@Adám 20 20

Adám

Do you want an exercise task?

Fmbalbuena

22:11

but uhh using ∇.

Adám

No, that has to use at least two lines.

Fmbalbuena

@Adám yeah but not now.

Adám

@Fmbalbuena OK, for when you come back (I have to go soon too): Define a dyadic function To that takes two numbers, the left being smaller or equal to the right, and returns the range. E.g. 3 To 8 should give 3 4 5 6 7 8

hyper-neutrino

22:28

i came up with hover for spoiler but i'm quite dissatisfied with that (10)

do you have a target byte count that would be reasonable for me to aim for?

Adám

@hyper-neutrino You should be able to hit 8, while 5 is possible as a tacit function. Still, these solutions are not efficient, and now what I had in mind for Fmbalbuena, as I only planned on them using what I've taught them.

hyper-neutrino

@Adám ah, okay, thanks. i've unfortunately forgotten pretty much all of apl's tacit rules due to never using them so i'm getting it confused with jelly, so i'll take this as a good exercise and try to get it to 5 using tacit

hover gets me somewhat close but it's not quite correct (on top of being too long). not sure if it's the right approach but i have to go for a bit as well

Adám

An efficient solution is 14 as a dfn, 12 tacit.

Fmbalbuena

23:33

@Adám Writing in APL unicode

Adám

Is that a question?

Fmbalbuena

No, i'm writing a dyadic function To that takes two numbers, the left being smaller or equal to the right, and returns the range. E.g. 3 To 8 should give 3 4 5 6 7 8

Adám

OK.

Fmbalbuena

@Adám ⋄F←{(⍺-1)+⍳((⍵-⍺)+1)}⋄⎕←5 F 99

TryAPL

@Fmbalbuena

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Adám

23:38

@Fmbalbuena That's almost perfect. Do you think you could get rid of some (not all) parentheses?

Remember that every APL function takes as right argument, everything to its right.

Fmbalbuena

@Adám I'm not thinking about code golf but i will

⋄F←{(⍺-1)+⍳(⍵-⍺)+1}⋄⎕←5 F 99

TryAPL

@Fmbalbuena

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Adám

Almost.

Fmbalbuena

@Adám correct?

Adám

Yes, but you can get rid of the parenthesis around ⍵-⍺ if you restructure a little.

Fmbalbuena

23:41

lol TryAPL can't edit

Adám

Right, it only has 2 mins.

Fmbalbuena

but @TryAPL is stuck? ⎕←'No, I''m not stuck'

TryAPL

@Fmbalbuena Yes, I'm stuck

Fmbalbuena

LOL

Who edited?

⎕←'TryAPL is not stuck'

TryAPL

@Fmbalbuena TryAPL is not stuck

Fmbalbuena

23:47

@Adám can you create weekly and daily CMC? (weekly must be hard)

Adám

Sorry, I can't commit to that, especially with a limited vocabulary. Learn a bit more APL, and you can start solving the tasks at problems.tryapl.org

Fmbalbuena

uh

@Adám Print using lambda?

Adám

Yes, all of those are possible as 1-liner lambdas (we usually call those "dfns", pronounced "DEE-funs").

You may need to use ⋄ though.

@Fmbalbuena Oh, no need to print. You'll want to return the result.

Fmbalbuena

@Adám Can you convert lambda:(print("Hello, World!")) to APL?

Adám

I'm not sure I understand that code. Does it take an argument?

Bubbler

23:53

It's just {⎕←'Hello, World!'}

or

Fmbalbuena

⋄Print←{⎕←'Hello, World!'}⋄Print

Bubbler

∇f
⎕←'Hello, World!'
∇

TryAPL

@Fmbalbuena
NOT PERMITTED: Illegal token
      Print←{⎕←'Hello, World!'} ⋄ Print
     ^

Adám

Heh.

Fmbalbuena

@Bubbler Lambda

Bubbler

23:54

Lambda always takes one or two args, there's no zero-arg lambda

Fmbalbuena

⋄{⎕←'Hello, World!'}

TryAPL

@Fmbalbuena
NOT PERMITTED: Illegal token
      {⎕←'Hello, World!'}
     ^

Adám

TryAPL doesn't allow inline printing.

Bubbler

Is ⎕← not allowed in tryapl?

Oh.

Fmbalbuena

@Bubbler Python: I am a joke to you?

Bubbler

23:55

(in some sense) You forget python to learn APL, yes.

Fmbalbuena

@Bubbler i have already learned all python (except some bulitin modules).

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