> Where can I read about functions that have comma and non-comma parsings?

in my own words:

BLOCK means { code } in curlies, like map { $_ +1 } 1..3, so no comma

  DB<124> map { $_ +1 } 1..3
 => (2, 3, 4)

[download]

EXPR can be any "atomar" code-snippet.

  DB<128> map  sqrt , 1..3
 => (1, "1.4142135623731", "1.73205080756888")

  DB<129> map  5 , 1..3
 => (5, 5, 5)

[download]

in both cases the list values are passed by setting a special variable (aka default variable) $_

according to perlglossary

       BLOCK
           A syntactic construct consisting of a sequence of Perl stat
+ements
           that is delimited by braces.  The "if" and "while" statemen
+ts are
           defined in terms of BLOCKs, for instance.  Sometimes we als
+o say
           "block" to mean a lexical scope; that is, a sequence of sta
+tements
           that act like a "BLOCK", such as within an eval or a file, 
+even
           though the statements aren’t delimited by braces.

...

       expression
           Anything you can legally say in a spot where a "value" is
           required.  Typically composed of literals, variables, opera
+tors,
           functions, and "subroutine" calls, not necessarily in that 
+order.

[download]

Cheers Rolf

( addicted to the Perl Programming Language)

In reply to Re^5: map sub to list? (glossary) by LanX
in thread map sub to list? by pldanutz

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