It also helps to actually "return 1;" instead of just "1;"
In general use the short form only when you are really at the end of a subroutine. do blocks are not really subroutines.
#!/usr/bin/perl
use strict;
use warnings;
# let's just remove the else
sub foo {
if (@_) {
return do { my $dummy; return 1; };
}
0;
}
sub bar {
if (@_) {
return do { my $dummy; return 1; };
} else {
0;
}
}
print foo() . ' ' . foo('baz') . "\n"; # 1 0
print bar() . ' ' . bar('baz') . "\n"; # also 1 0
Update:
I noticed that the above script is bad style for a direct return from the subroutine. You should use eval instead of do.
See the example below.
#!/usr/bin/perl
use strict;
use warnings;
# let's just remove the else
sub foo {
if (@_) {
return 10 + do { my $dummy; return 1; };
}
0;
}
sub bar {
if (@_) {
return 10 + eval { my $dummy; return 1; };
}
0;
}
print foo() . ' ' . foo('baz') . "\n"; # 1 0
print bar() . ' ' . bar('baz') . "\n"; # 11 0