Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw
 
PerlMonks  

Re^2: Foreach Loops

by spurperl (Priest)
on Mar 16, 2005 at 10:58 UTC ( #439901=note: print w/ replies, xml ) Need Help??


in reply to Re: Foreach Loops
in thread Foreach Loops

Such a get_index_of operator would be inefficient, hence it doesn't make much sense for Perl to have it.

Think about it - an array is a linear structure meant specifically for random-access of index->element. To find the index of some element you will either have to go through the array looking for the element - this is O(N). You can have more time-efficient algorithms at the cost of space, like having a "mirror" hash of element->index.

As for your original problem, I also sometimes feel a little itch when I have to give up foreach once access to elements other-than-the-current is required.


Comment on Re^2: Foreach Loops

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://439901]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others musing on the Monastery: (6)
As of 2014-07-13 22:34 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    When choosing user names for websites, I prefer to use:








    Results (252 votes), past polls