This channel is intended for people just starting with the Raku Programming Language (raku.org). Logs are available at irclogs.raku.org/raku-beginner/live.html
Set by lizmat on 8 June 2022.
01:27 Manifest0 left 01:52 MasterDuke joined
scullucs How do I go from $s = "abc\ndef\n" to 02:54
MasterDuke scullucs: it appears some of your message got cut off here on irc, all i see is `How do I go from $s = "abc\ndef\n" to` 02:59
scullucs Oh, this channe is bridged? Sorry. I thought I was on Discord side only. 03:00
Hang on, I'll rephrase anyway.
lucs Hi. 03:02
How do I obtain ['a', 'b', 'c', 'd'] given "ab\ncd\n".
I keep tripping up with embedded Seq. 03:03
MasterDuke m: say "ab\ncd\n".lines.join.comb 03:04
camelia (a b c d)
MasterDuke m: say "ab\ncd\n".comb.grep(* ne "\n") 03:05
camelia (a b c d)
MasterDuke m: say "ab\ncd\n".comb(/\w/) 03:06
camelia (a b c d)
lucs I get it. 03:07
MasterDuke couple different options
lucs Thanks.
MasterDuke np
lucs I think my problem was coming from trying things like this: 03:09
m: my @a = < a b >; @a.push: 'de'.comb; say @a 03:10
camelia [a b (d e)]
lucs How do I flatten out that (d e) (Hmm... flatten...) 03:11
MasterDuke m: my @a = < a b >; @a.append: "de".comb; say @a 03:12
camelia [a b d e]
lucs Ah, append, thanks 03:13
MasterDuke np
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yabobay m: "4" + "1" 20:36
Raku eval WARNINGS for /home/glot/main.raku: Useless use of "+" in expression "\"4\" + \"1\"" in sink context (line 1)
yabobay well that's not whati it does on my machine
m: '4' + '1'
Raku eval WARNINGS for /home/glot/main.raku: Useless use of "+" in expression "'4' + '1'" in sink context (line 1)
librasteve m: "4"+"1" 20:50
say m: "4"+"1" 20:51
m: say "4"+"1"
Raku eval 5
librasteve phew 20:52
seems like the Discord <=> IRC bridge struggles with quotes ... so I think the recipe is vanilla m: and then put the actual code in backticks 20:53
yabobay oh ok well what i wanted to ask is if this is doable why do we need allomorphs again i asked this before but it still doesn't really make sense
librasteve raku has optional types - this code is untyped - a numeric operator like + will coerce its operand to numbers if that can be done - when you coerce a Str to a Real the string is reparsed if possible 21:00
m: say "4".WHAT; say "4".Real.WHAT; say (+"4").WHAT; 21:02
Raku eval (Str) (Int) (Int)
librasteve in raku (as in perl iirc) the + in +"4", like any numeric operator can be used as shorthand to do the coercion 21:03
--- 21:04
the question arises when we want to add types (since Raku has optional types)
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yabobay exactly. so if types get coerced, why are there IntStrs? 21:06
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librasteve m: `sub add(Int $a, Int $b) {$a+$b}; say add("4","1"); 21:07
Raku eval Exit code: 1 ===SORRY!=== Error while compiling /home/glot/main.raku Bogus statement at /home/glot/main.raku:1 ------> <BOL>⏏`sub add(Int $a, Int $b) {$a+$b}; say ad expecting any of: prefix statement list term
librasteve m: sub add(Int $a, Int $b) {$a+$b}; say add("4","1");
Raku eval Exit code: 1 ===SORRY!=== Error while compiling main.raku Calling add(Str, Str) will never work with declared signature (Int $a, Int $b) at main.raku:1 ------> sub add(Int $a, Int $b) {$a+$b}; say ⏏add("4","1");
librasteve (oops got the backticks right the second time!) 21:08
yabobay why do operators like + coerce values but function calls don't?
ab5tract m: sub add(Int() $a, Int() $b) { say $a+$b; say $a.WHAT, $b.WHAT}; add("4","1"); 21:09
camelia 5
(Int)(Int)
librasteve hi ab5tract! good point, you can put coercers on the signature to solve this with the () parens after the type such as Int() 21:10
ab5tract m: multi sub add(Int(Str) $a, Int(Str) $b) { say "coercing Str to Int"; dd :$a, :$b }; multi sub add(Int(Num) $a, Int(Num) $b) { say "coercing Num to Int"; dd :$a, :$b }; add("4","1"); add(4.4e0, 2.3e0) 21:11
camelia coercing Str to Int
:a(4)
coercing Num to Int
:b(1)
:a(4)
:b(2)
librasteve docs.raku.org/language/operators#infix_+ 21:12
yabobay oh i see
librasteve ^^ the docs tell you that the operator coerces (just an fyi) - as to why - well raku when untyped behaves like I said above so that it is very similar to perl and very dynamic and flcexible for things like one liners 21:13
and ab5tract has also shown that you can restrict the type that is coerced - with stuff like Int(Str) - so Int() means I will take any type and coerce to Int and Int(Str) means I will only take Str and then try to coerce it to Int ... I suppose that I would call this gradual typing in that coercion is a great tool to shape your arguments into types that can be handled in strongly typed code 21:16
ab5tract librasteve++ 21:18
librasteve @yabobay - as to your question about Allomorphs - I suggest you read this rakujourney.wordpress.com/2023/05/...lomorphia/ and this rakujourney.wordpress.com/2024/04/...s-unicode/ if you want your question answered deeply 21:21
yabobay lol shameless plug 21:25
librasteve there is a (valid) case that Allomorphs are less needed now that we have coercion types - personally I think that they can occasionally be quite useful, but they are not really needed for day to day raku
other blogs are available XD 21:26
23:31 rakufan1 joined
tbrowder howdy, non-thread but old raku user having thread issues. 23:40
i use two main class instances from David Warring's PDF modules that call instances from the C FreeFont2 library 23:46
how can i protect or limit the number of instances used? 23:48

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