Beefy Boxes and Bandwidth Generously Provided by pair Networks
Don't ask to ask, just ask
 
PerlMonks  

Re: my $x or my ($x)

by ambrus (Abbot)
on Apr 04, 2006 at 12:14 UTC ( #541136=note: print w/replies, xml ) Need Help??


in reply to my $x or my ($x)

my $x and my($x) differ only when it's used on the left hand side of an assignment. In that case, when you write my $x = FOO, FOO is evaluated in scalar context, if you say my($x) = FOO, it's evaluated in list context, and the first value in the list is assigned to $x (undef if the list is empty).

A common example is a sub starting with sub { my($x) = @_; meaning that the sub would receive one argument and copy it to $x. In this case, sub { my $x = @_; wouldn't work, as it would store the number of arguments to $x.

This is, however, not specific to my: if you write an assignment like $x = FOO or ($x) = FOO, the same rules apply, only it doesn't create a new lexical variable $x but uses the existing variable.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://541136]
help
Chatterbox?
[hippo]: Database is the 2nd column.
shmem .oO( docker. docker. docker? docker. docker! docker )
[shmem]: at least, some Ook.
[erix]: another simple Pg thing is to running a database off a tsv (alas, readonly)
[erix]: I'm waiting for that zipfile-reading to show up in DBD::SQLite :)
[Corion]: hippo, erix: That sounds promising :)
[Corion]: erix: I misinterpreted that. It only allows to read a zipfile like a table, not reading a database from a zipfile :-(
shmem is grabbed by nostalgia for Bolivia
[erix]: aah, ok.
[erix]: oh well, in each life some rain must fall

How do I use this? | Other CB clients
Other Users?
Others chilling in the Monastery: (8)
As of 2018-02-23 15:18 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    When it is dark outside I am happiest to see ...














    Results (302 votes). Check out past polls.

    Notices?