Re^2: Perlplexation - foreach shoulda Known

in reply to Re: Perlplexation - foreach shoulda Known
in thread Perlplexation - foreach shoulda Known

I've had Effective Perl Programming for a year now, and really enjoyed it, but for some reason missed the detail until just this last week... I was "whoah!" and decided to try out a bunch of examples. :)

So are "aliases" used in other Perl commands besides these sorts of loops? Is that what $a and $b are considered to be in the sort command?

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Re^3: Perlplexation - foreach shoulda Known by eyepopslikeamosquito (Archbishop) on Apr 16, 2012 at 21:09 UTC
So are "aliases" used in other Perl commands besides these sorts of loops? Is that what $a and $b are considered to be in the sort command? Yes and yes. Some places aliases are used: `$_` in foreach, map and grep `$a` and `$b` in a sort block `$a` and `$b` in List::Util's reduce function and List::MoreUtils's pairwise function Each element of `@_` for the actual arguments in a subroutine call By packages importing symbols By an our declaration, which creates a lexically scoped alias You can explicitly create an alias via typeglobs See also "alias" in perlglossary and Item 118 "Access the symbol table with typeglobs" in Effective Perl Programming.	[reply] [d/l] [select]

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Re^3: Perlplexation - foreach shoulda Known
by eyepopslikeamosquito (Archbishop) on Apr 16, 2012 at 21:09 UTC

So are "aliases" used in other Perl commands besides these sorts of loops? Is that what $a and $b are considered to be in the sort command?

$_ in foreach, map and grep
$a and $b in a sort block
$a and $b in List::Util's reduce function and List::MoreUtils's pairwise function
Each element of @_ for the actual arguments in a subroutine call
By packages importing symbols
By an our declaration, which creates a lexically scoped alias
You can explicitly create an alias via typeglobs

See also "alias" in perlglossary and Item 118 "Access the symbol table with typeglobs" in Effective Perl Programming.

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