Re^2: defining variables using my

Replies are listed 'Best First'.
Re^3: defining variables using my - subroutines by Corion (Patriarch) on Sep 05, 2012 at 14:14 UTC
Have you read Coping with Scoping?	[reply]
Re^3: defining variables using my - subroutines by kennethk (Abbot) on Sep 05, 2012 at 17:34 UTC
Under normal usage, they take values not variables. If you run the code `sub add_one { my $x = shift; $x += 1; return $x; }` [download] You would not expect the variable you passed in (`my $y = add_one($outer_x);`) to change value, right? This is a little awkward/contrived, but this is in contrast to more object-oriented frameworks. Advanced: Of course Perl actually does pass by reference with lvalues bound to @_. But that's probably the best reason for transferring subroutine inputs to locally-scoped variables. #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.	[reply] [d/l] [select]
Re^3: defining variables using my - subroutines by Anonymous Monk on Sep 05, 2012 at 18:18 UTC
`$scalar = ( 1, 2, 3 );` [download] $scalar is a variable, it exists past this line, but `( 1, 2, 3 );` is a list of value, it does not exist past that line `@array = ( 'list item 1', 2, 'another value', 'yet another value ');` [download] an @array is a variable, it has a name, it exists past the line, it is a bucket, you store scalars inside	[reply] [d/l] [select]


Pathologically Eclectic Rubbish Lister
	PerlMonks