Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses
 
PerlMonks  

Re^5: $_ functions vs argument-using functions

by Laurent_R (Monsignor)
on Sep 09, 2013 at 22:36 UTC ( #1053115=note: print w/ replies, xml ) Need Help??


in reply to Re^4: $_ functions vs argument-using functions
in thread $_ functions vs argument-using functions

Very interesting information, indeed. As I am sure many other monks before me and probably others after and in the future, I have tried a couple of years ago to rewrite in Perl a "my_map" and a "my_grep" functions (just for the sake of experimenting). And, if my memory serves me right, I ended up writing a simple anonymous function; then adding a code-ref prototype to my_map was all what was needed to mimic exactly the block syntax of map (getting rid of the sub keyword). So, I also considered the map block to be more or less equivalent to an anonymous function and I actually wrote today, just a few hours ago, in answer to another question of the original poster of this thread, that "the (map) block can be regarded as an anonymous function" (in this thread: map sub to list?). From the functional point of view that I was using, I think it is probably right to put it this way and that I probably don't need to change anything to my formulation, but it is quite interesting to know that from an implementation point of view, there is a significant difference which has an impact on performance. Anyway, thank you for the implementation details, this is very useful to know.


Comment on Re^5: $_ functions vs argument-using functions

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1053115]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others rifling through the Monastery: (9)
As of 2015-07-30 07:34 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (270 votes), past polls