Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer
 
PerlMonks  

Re: ${Schwartzian transform} ?

by Abigail-II (Bishop)
on Sep 18, 2003 at 12:14 UTC ( #292368=note: print w/replies, xml ) Need Help??


in reply to Re: ${Schwartzian transform} ?
in thread ${Schwartzian transform} ?

While $_ in a map is an alias, it doesn't mean that $_ in rvalue context magically resolves to the alias instead of the value. Watch:
perl -wle '@a = 1; @b = map {++ $_ -> [0]} map {[$_]} @a; print "@a"; +print "@b"' 1 2

No alias passes out of the right-most map.

Or a shorter example:

perl -wle '@a = 1; @b = map {$_} @a; $a [0] ++; print "@a @b"' 2 1

@b isn't an array whose elements are aliases for the elements of @a.

Abigail

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://292368]
help
Chatterbox?
[Discipulus]: [OT] if i have an svg image (a map of italian provinces) like this one in which way i need to interact with it to have a geochart?
[Corion]: I haven't found a good way to plot stuff into country maps... Maybe one of the demos of D3.js has something usable?

How do I use this? | Other CB clients
Other Users?
Others romping around the Monastery: (13)
As of 2017-03-23 09:18 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Should Pluto Get Its Planethood Back?



    Results (285 votes). Check out past polls.