3 ms·

A classic (hope I didn't get it wrong): print "[", +( join '', map { "-> $_" } @$_ ), "]" for @{$ref}

• petre 6y ago
  The concatenation operator is . in Perl and ~ in Raku. You could write a normal, braced foreach loop with another one inside and not use $_.
• notyourday 6y ago
  > print "[", +( join '', map { "-> $_" } @$_ ), "]" for @{$ref} Because computers are so slow, memory is so limited and disk space is so expensive the programmer absolutely had to write it in a single line in the most convoluted way possible? Yeah, that's definitely a language fault.
  • ricardobeat 6y ago
    This is pretty idiomatic Perl, and I've seen similar constructs countless times at work. You could indent the map body but it normally wouldn't be done for such a short expression. There is not much room for maneuver there if you don't want intermediate variables. And this is a quick sample, there is much, much hairier stuff to be found in real code. "Knowing the language well" is seen as a virtue for many.