Re: last in do vs last in while/for

'Isn't do {} while as much a loop as while () {}?'

not exactly. if you are do-whileing then you are evaluating loop after you do something , so technically you are not in the loop, that is how you make sure that something is done (in the 'contents' of a loop) even if a condition is not good to go. and because perl complains ('Can't "last" outside a loop block at -e line 1.') it should be obvious that last is dependent on a loop

hope this helps (please anyone correct if i'm wrong)

Comment on Re: last in do vs last in while/for

Replies are listed 'Best First'.
Re^2: last in do vs last in while/for by ikegami (Patriarch) on Mar 04, 2009 at 19:34 UTC
It doesn't matter whether the it's bottom tested or not. For example, you can break out of bottom tested loops in Visual Basic. Also, consider `local $\="\n"; print('a'); { print('b'); last; print('c'); } print('d');` [download] `a b d` [download] versus `local $\="\n"; print('a'); do { print('b'); last; print('c'); }; print('d');` [download] `a b Can't "last" outside a loop block at a.pl line 5.` [download] See bellaire's post for the real reason.	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re^2: last in do vs last in while/for
by ikegami (Patriarch) on Mar 04, 2009 at 19:34 UTC

It doesn't matter whether the it's bottom tested or not. For example, you can break out of bottom tested loops in Visual Basic.

Also, consider

local $\="\n";
print('a');
{
   print('b');
   last;
   print('c');
}
print('d');
[download]

a
b
d
[download]

versus

local $\="\n";
print('a');
do {
   print('b');
   last;
   print('c');
};
print('d');
[download]

a
b
Can't "last" outside a loop block at a.pl line 5.
[download]

See bellaire's post for the real reason.

[reply]
[d/l]
[select]