Re: What is this Perlism called...and what does it do?

Ahhh. Thanks all. For some reason my brain just didn't see <foo> inside the parentheses as a filehandle. I kept trying to figure out what the (<...>) operator was. And man, searching Google for "parentheses less-than perl" or "parentheses angle-bracket operator perl" is...not useful. :D

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Re^2: What is this Perlism called...and what does it do? by LanX (Saint) on Oct 29, 2021 at 14:24 UTC
> didn't see <foo> inside the parentheses as a filehandle In this case it's not a `readline` filehandle but a `glob` pattern like choroba already explained. The DWIM rules to distinguish between `glob` and `readline` are more complex tho °, but it's mostly evident by context. > And man, searching Google for "parentheses less-than perl" or ... try Perl Diamond Operator. As a rule of thumb, if you need to look up a Perl operator, search `perlop` (sic) Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery} °) from `perlop#I/O-Operators` > That means <$x> is always a readline() from an indirect handle, but <$hash{key}> is always a glob(). That's because $x is a simple scalar variable, but $hash{key} is not--it's a hash element. Even <$x > (note the extra space) is treated as glob("$x "), not readline($x).	[reply]

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Re^2: What is this Perlism called...and what does it do?
by LanX (Saint) on Oct 29, 2021 at 14:24 UTC

> didn't see <foo> inside the parentheses as a filehandle

In this case it's not a readline filehandle but a glob pattern like choroba already explained.

The DWIM rules to distinguish between glob and readline are more complex tho °, but it's mostly evident by context.

> And man, searching Google for "parentheses less-than perl" or ...

try Perl Diamond Operator.

As a rule of thumb, if you need to look up a Perl operator, search perlop (sic)

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

Wikisyntax for the Monastery}

°) from perlop#I/O-Operators

> That means <$x> is always a readline() from an indirect handle, but <$hash{key}> is always a glob(). That's because $x is a simple scalar variable, but $hash{key} is not--it's a hash element. Even <$x > (note the extra space) is treated as glob("$x "), not readline($x).

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