Re: Auto-incrementing strings in for loops

Replies are listed 'Best First'.
Re^2: Auto-incrementing strings in for loops by ikegami (Patriarch) on Nov 20, 2009 at 04:47 UTC
No. The `for` has the lowest of priorities. `$_++ and say for 1..2;` [download] is not equivalent to `$_++ and ( say for 1..2 );` [download] That's not even legal. The original statement is indeed equivalent to `( $_++ and say ) for 1..2;` [download]	[reply] [d/l] [select]
Re^2: Auto-incrementing strings in for loops by JadeNB (Chaplain) on Nov 20, 2009 at 04:19 UTC
it seems to me that for part 2 you are 'say'ing the for loop and thus $_ will be the constant 1 then 2. Thanks for your thoughts, but the parsing you suggest is not quite right: `$ perl5.10 -MO=Deparse,-p -E 'say for 1..2' BEGIN { $^H{'feature_say'} = q(1); $^H{'feature_state'} = q(1); $^H{'feature_switch'} = q(1); } ; say($_) foreach (1 .. 2); -e syntax OK` [download] That is, `say for ...` is understood as `say($_) for ...`. The problem is, unfortunately, much sillier than that: `for` aliases `$_`, so I wasn't incrementing the variable that I thought I was incrementing!	[reply] [d/l] [select]