Clear questions and runnable code get the best and fastest answer |
|
PerlMonks |
comment on |
( [id://3333]=superdoc: print w/replies, xml ) | Need Help?? |
Well, I would characterize the reason as having more to do with the fact that passing $a = 2 as an argument causes an alias to $a to be put into @_. Had a copy of $a's value been placed into @_ instead, then subsequently changing $a to 3 would not impact that copy.
The reason that $a = 2 passes an alias is because it is an "lvalue" expression, which just means that you can do previously mentioned things like ( $a = 2 ) = 3. And the reason that lvalue expressions cause aliases to be passed is two-fold: So you can modify arguments via code like $_[0] = 3 in your sub and because it is more efficient than creating a copy. - tye In reply to Re^5: ternary conditional help (alias)
by tye
|
|