Re^4: Check if key exist in hash but not exact match

Replies are listed 'Best First'.
Re^5: Check if key exist in hash but not exact match ( meaning of " @{[...]} " ) by LanX (Saint) on Apr 04, 2023 at 21:51 UTC
> What is triggering the code evaluation of max(...) here? `" @{[...]} "` is an idiomatic pseudo-operator by combining several mechanisms String interpolation work not only for arrays but also for dereferencing of arrays. `" @{$a_ref} "` The `[...]` marks an anonymous array-ref. `" @{[ 1, 2, 3 ]} "` Lists can also include code statements to be executed `" @{[ 1, 2, some_code() ]} "` The returned list will be included into the string. `DB<6> p ">>> @{[ 1, 2, time() ]} <<<" >>> 1 2 1680647910 <<< DB<7>` [download] Cheers Rolf _{(addicted to the 𐍀𐌴𐍂𐌻 Programming Language :) Wikisyntax for the Monastery} update added code examples for each step	[reply] [d/l] [select]
Re^5: Check if key exist in hash but not exact match by eyepopslikeamosquito (Archbishop) on Apr 04, 2023 at 22:23 UTC
Definitely adding this to my snippet file! But I've never seen this syntax before. `@{[]}` is the famous Baby Cart Secret Operator. I must say I'm shocked LanX didn't mention his visualization of this operator, namely "a guy with sombrero dragging a sled(ge) uphill" ... which is why he usually refers to it as the Mexican Sledge operator. See also: Secret Operator References	[reply] [d/l]
Re^5: Check if key exist in hash but not exact match by kcott (Archbishop) on Apr 04, 2023 at 22:41 UTC
G'day ibm1620, The `@{[...]}` construct is one of many that are referred to as "Perl secret operators and constants". This one, called "Baby cart", has been around for a very long time. Follow that link for an answer to your question as well as other information. I have been using it since the 1990s and, as I recall, wasn't even aware that it was a perlsecret until much later. I think I first encountered it in one of the "O'Reilly Perl books". I don't remember which one; although, "Advanced Perl Programming" is a likely candidate. Note that's the original edition; "Advanced Perl Programming, 2nd edition" is completely different — a very poor choice of title in my opinion. — Ken	[reply] [d/l]
Re^6: Check if key exist in hash but not exact match by ibm1620 (Hermit) on Apr 05, 2023 at 12:11 UTC
contented sigh I love Perl.	[reply]

update