Re: How do I use the map command for this?

"How do I use the map command for this?"
"I am pretty sure I need to use the map command"

The map statement is just a short-hand way of writing a simple "for" loop.
ALL map's can be expressed as "for" (foreach) loops.
Perl generates the same code for a "map" as the equivalent "foreach" loop.

map{} is not your issue.

I think looking at Bio::Perl will lead to some suggestions for you. There are many routines optimized for the FASTA format.

Comment on Re: How do I use the map command for this? Download Code

Replies are listed 'Best First'.
Re^2: How do I use the map command for this? by Anonymous Monk on Jun 21, 2022 at 05:38 UTC
Perl generates the same code for a "map" as the equivalent "foreach" loop. wrong	[reply]
Re^3: How do I use the map command for this? by Marshall (Canon) on Jun 22, 2022 at 22:02 UTC
Would certainly enjoy being educated. I probably should have said "similar". A map is a looping statement.	[reply]
Re^4: How do I use the map command for this? by Fletch (Bishop) on Jun 23, 2022 at 21:46 UTC
Both for and map iterate over lists, but the latter has the extra purpose that it returns a transformed copy of the list. There's been optimizations that make map in void context efficient (or at least not as inefficicent as it used to be) so you could use `map { do_something( $_ ) @list` in place of `for (@list) { do_something( $_ ) }`, but it's clearer/cleaner to use `for` for iteration and `map` for transformation and not muddle the two. The cake is a lie. The cake is a lie. The cake is a lie.	[reply] [d/l] [select]
Re^5: How do I use the map command for this? by AnomalousMonk (Archbishop) on Jun 24, 2022 at 00:34 UTC
Re^5: How do I use the map command for this? by Marshall (Canon) on Jun 29, 2022 at 18:12 UTC
Re^4: How do I use the map command for this? by LanX (Saint) on Jun 23, 2022 at 20:10 UTC
> A map is a looping statement. `map` is a built-in function used as expression, not a statement you are right that most uses can be transformed, but there are differences in syntax and implementation as an example, `for` - like most non-simple statements - doesn't return values. edit see also Re: why does Perl eval have a strange terminator? Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply]
Re^4: How do I use the map command for this? by Anonymous Monk on Jun 23, 2022 at 04:52 UTC
B::Concise	[reply]


go ahead... be a heretic
	PerlMonks

Re: How do I use the map command for this?

edit