Dan Sopher wrote:
Aside from the syntax, is there a difference in the way 'map' and
'foreach' process?
Hi Dan
Internally they're very similar, but you shouldn't be thinking like that.
As Randal said, foreach is a statement - a language construct like 'if',
'while', 'else' and so on - while map is an expression - more specifically
a function.
Use foreach if you want to execute a block of Perl code for every element
in a list.
Use map to implement a /mapping/ between two lists. It takes an input list
and a statement or a block specifying a transformation, and (in list
context) returns the list with that transformation applied to each element.
Conceptually there is no loop - the entire list is transformed at once, and
a scalar expression like
$a = 2 * $b
corresponds exactly to the list expression
@a = map 2 * $_, @b
HTH,
Rob
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