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Re^5: perldelta unclear on 'given's fate

by LanX (Chancellor)
on Jan 04, 2014 at 16:00 UTC ( #1069296=note: print w/replies, xml ) Need Help??

in reply to Re^4: perldelta unclear on 'given's fate
in thread perldelta unclear on 'given's fate

It's essentially the same with For-If just the fall trough is inverse.

See provided code examples.


i.e. you need to terminate with explicit next statements to avoid fall through.

for ($var){ if (/abc/) { print "abc"} # falls through if (/def/) { print "def" ;next} if (/xyz/) { print "xyz" ;next} print "default"; }

Cheers Rolf

( addicted to the Perl Programming Language)

Replies are listed 'Best First'.
Re^6: perldelta unclear on 'given's fate
by Tommy (Chaplain) on Jan 05, 2014 at 21:15 UTC

    I actually think that's pretty cool, despite my desire to see a native switch. I have often use hash constructs to accomplish switch-like behavior, and I think that the for ( $var ) ... approach is much nicer...

    # Example of the hash-construct "switch", which is limited and has no +"default". # The output of this code is "abc" use Moo; my $val = 'c'; my @args = qw( abc ); my $obj = __PACKAGE__->new(); { a => sub { say 'a' }, b => \&b, c => sub { $obj->c( @_ ) }, }->{ $val }->( @args ); sub b { say 'b' }; sub c { shift; say for @_ };

    A mistake can be valuable or costly, depending on how faithfully you pursue correction
Re^6: perldelta unclear on 'given's fate
by Bloodnok (Vicar) on Jan 06, 2014 at 14:18 UTC
    Hmmm LanX, not unlike the construct I found when and have used ever since, I was looking for an alternative to the Switch modules available at the time - viz...
    for ($var){ SWITCH: { /abc/ && do { print "abc"} # falls through /def/ && do { print "def" ; last SWITCH } /xyz/ && do { print "xyz" ; last SWITCH } print "default"; }; . . }
    A construct I much prefer (for readability if nothing else) to what sometimes appear to extend to seemingly interminable if-elif-else constructs.

    A user level that continues to overstate my experience :-))

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