Hi Bill,
:_ is a Pair with the colon syntax that stands for "_" => True. In the first
case, it got passed as a named argument and say ignored it. The second case was
a method call using the colon syntax - the syntax lizmat challenged not so long
ago. https://github.com/Raku/problem-solving/issues/384 so, ultimately, it was
(:_).say, a normal say method call on a Pair.
Cheers
A(z) Galaxy eszközömről küldve
-------- Eredeti üzenet --------
Feladó: William Michels <w...@caa.columbia.edu>
Dátum: 2023. 09. 25. 7:15 (GMT+01:00)
Címzett: perl6-users <perl6-users@perl.org>
Tárgy: What does `:_` and/or `:_:` signify?
Hello,
While playing around in an attempt to define new operators, I stumbled upon
some curious results.
In the REPL, trying `say :_` returns a blank line.
In the REPL, trying `say :_:` returns `_ => True`.
What is the meaning of this?
admin@mbp ~ % raku
Welcome to Rakudo™ v2023.05.
Implementing the Raku® Programming Language v6.d.
Built on MoarVM version 2023.05.
To exit type 'exit' or '^D'
[0] > say _
===SORRY!=== Error while compiling:
Undeclared name:
_ used at line 1
[0] > say :_
[0] > say :_:
_ => True
[0] >
