Re^2: Why is Dumper returning "!!1" for true file test?

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Re^3: Why is Dumper returning "!!1" for true file test? by LanX (Saint) on Jan 21, 2024 at 00:11 UTC
> Saves a character and a runtime op... And is confusing because you need to mentally negate it again, while `!!` is a common idiom. But the performance question occurred to me already I kind of expected constant folding to happen. update ha, indeed! :) `DB<5> p B::Deparse->new()->coderef2text( sub{!!1} ) { use feature ... ; # shortened !0; } DB<6> p B::Deparse->new()->coderef2text( sub{!!0} ) { use feature ... ; # yadda !1; } DB<7> p $] 5.038002` [download] Cheers Rolf _{(addicted to the Perl Programming Language :) see Wikisyntax for the Monastery}	[reply] [d/l] [select]

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Re^3: Why is Dumper returning "!!1" for true file test?
by LanX (Saint) on Jan 21, 2024 at 00:11 UTC

> Saves a character and a runtime op...

And is confusing because you need to mentally negate it again, while !! is a common idiom.

But the performance question occurred to me already I kind of expected constant folding to happen.

update

ha, indeed! :)

  DB<5> p B::Deparse->new()->coderef2text( sub{!!1} )
{
    use feature ... ; # shortened
    !0;
}
  DB<6> p B::Deparse->new()->coderef2text( sub{!!0} )
{
    use feature ... ; # yadda
    !1;
}
  DB<7> p $]
5.038002
[download]

Cheers Rolf
_{(addicted to the Perl Programming Language :)

see Wikisyntax for the Monastery}

[reply]
[d/l]
[select]