Hi Pierre,
my @tmp = ( $var1, $var2, $var3 );
@tmp = map modify_variable, @tmp;
which is better
Conway (in Perl Best Practices) prefers the block form of map, since in
his opinion, it's more readable. So you could rewrite it as:
my @tmp = ( $var1, $var2, $var3 );
@tmp = map { modify_variable } @tmp
I'm guessing that the code within modify_variable uses $_ under the
hood? That may end up biting you later on, if you use modify_variable
in different places. If $_ is in use by other code or gets changed on
you unexpectedly, you may have some difficult debugging ahead of you.
The following may prove clearer when reading it 6 months from now:
map { modify_variable($_) } = \($var1, $var2, $var3);
I personally like the above syntax - others may not. A foreach gets you
an alias to each element, so what about the following? I've provided a
modify_var sub as an example.
$var1 = 1;
$var2 = 2;
$var3 = 3;
foreach my $v ($var1, $var2, $var3) {
modify_var(\$v);
}
sub modify_var {
my $scalar_ref = shift || die "blaaaaa";
${$scalar_ref} += 5;
}
$, = "\n"; ## print a newline between each argument to print
print ($var1, $var2, $var3);
-m
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