Array problem

I have an array like this:
array = [ "manyThings.mp3", "myLike.gif", "moreCoco.bmp",
"theFormat.bmp"]

and I want to make some comparison to eliminate all the words in the
array that are NOT of the bmp format. So at the end the array will look
like this:

array = ["moreCoco.bmp", "theFormat.bmp"]

is there a way to do this???

Many thanks for the help

···

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John Zoldiark wrote:

I have an array like this:
array = [ "manyThings.mp3", "myLike.gif", "moreCoco.bmp",
"theFormat.bmp"]

and I want to make some comparison to eliminate all the words in the
array that are NOT of the bmp format. So at the end the array will look
like this:

array = ["moreCoco.bmp", "theFormat.bmp"]

is there a way to do this???

Many thanks for the help

Hi John,
Yep, try this:

array.reject! {|elem| elem.split(".").last != "bmp"}

Cheers,
Sebastian

···

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I think this should do it:

array.delete_if { |elem| not elem =~ /.bmp/i }
It worked for the following test:
array = [ "manyThings.mp3", "myLike.gif", "moreCoco.BmP", "theFormat.bmp"]
array.delete_if { |elem| not elem =~ /.bmp/i }
array.each do |elem|
  puts elem
end

···

On Wed, Dec 17, 2008 at 8:22 PM, John Zoldiark <tavarezjonathan@gmail.com>wrote:

I have an array like this:
array = [ "manyThings.mp3", "myLike.gif", "moreCoco.bmp",
"theFormat.bmp"]

and I want to make some comparison to eliminate all the words in the
array that are NOT of the bmp format. So at the end the array will look
like this:

array = ["moreCoco.bmp", "theFormat.bmp"]

is there a way to do this???

Many thanks for the help
--
Posted via http://www.ruby-forum.com/\.

See Array#select
irb(main):007:0> array.select{|x| x.match(/.*\.bmp/)}
=> ["moreCoco.bmp", "theFormat.bmp"]

···

On Wed, Dec 17, 2008 at 9:22 PM, John Zoldiark <tavarezjonathan@gmail.com>wrote:

I have an array like this:
array = [ "manyThings.mp3", "myLike.gif", "moreCoco.bmp",
"theFormat.bmp"]

and I want to make some comparison to eliminate all the words in the
array that are NOT of the bmp format. So at the end the array will look
like this:

array = ["moreCoco.bmp", "theFormat.bmp"]

is there a way to do this???

Many thanks for the help
--
Posted via http://www.ruby-forum.com/\.

John Zoldiark wrote:

I have an array like this:
array = [ "manyThings.mp3", "myLike.gif", "moreCoco.bmp",
"theFormat.bmp"]

and I want to make some comparison to eliminate all the words in the
array that are NOT of the bmp format. So at the end the array will look
like this:

array = ["moreCoco.bmp", "theFormat.bmp"]

Instead of a reject/select you can also use grep when working with regexen:
array.grep(/\.bmp$/)
Instead of using a regex you could also use File.extname here:
array.select {|x| File.extname(x)==".bmp"}
Of course all these only tell you that the filenames end with .bmp, not in
which format the files actually are.

HTH,
Sebastian

···

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ICQ: 205544826

And just another note: generally, for transforming and/or iterating over
arrays, finding/removing elements, extracting values, and so on, you'll
want to take a look at Ruby's "Enumerable" module. It's available on all
the main collections in Ruby and is extremely handy.

Particularly, the "each", "select", "map", "partition" and "reject"
methods are very handy. I use "map" and "select" all the time.

···

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Actually, the regex should have the end of string anchor:
array.delete_if { |elem| not elem =~ /.bmp$/i }

···

On Wed, Dec 17, 2008 at 8:40 PM, Joshua Ball <chezball@gmail.com> wrote:

I think this should do it:

array.delete_if { |elem| not elem =~ /.bmp/i }
It worked for the following test:
array = [ "manyThings.mp3", "myLike.gif", "moreCoco.BmP", "theFormat.bmp"]
array.delete_if { |elem| not elem =~ /.bmp/i }
array.each do |elem|
puts elem
end

On Wed, Dec 17, 2008 at 8:22 PM, John Zoldiark <tavarezjonathan@gmail.com > >wrote:

> I have an array like this:
> array = [ "manyThings.mp3", "myLike.gif", "moreCoco.bmp",
> "theFormat.bmp"]
>
> and I want to make some comparison to eliminate all the words in the
> array that are NOT of the bmp format. So at the end the array will look
> like this:
>
> array = ["moreCoco.bmp", "theFormat.bmp"]
>
> is there a way to do this???
>
> Many thanks for the help
> --
> Posted via http://www.ruby-forum.com/\.
>
>

you might also want to anchor your regex
(the $ at the end) so that it won't work on
file names like 'foo.bmp.gz'. and be sure
to escape your . in front of bmp with \.

array.delete_if { |elem| elem !~ /\.bmp$/i }

also note the regex not match operator !~

cheers,
_c

···

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array.grep /bmp$/
=> ["moreCoco.bmp", "theFormat.bmp"]

Joshua Ball wrote:

Actually, the regex should have the end of string anchor:
array.delete_if { |elem| not elem =~ /.bmp$/i }

Also, remember that . is any character, whereas \. is just . for the
sake of getting exactly what you want. !~ looks cleaner to me, but
that's just personal preference in most cases.

···

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Arg... regex...I am new to them. :wink: You are right, of course.
Thanks (for the correction and the !~)

···

On Wed, Dec 17, 2008 at 8:57 PM, Tim Greer <tim@burlyhost.com> wrote:

Joshua Ball wrote:

>
> Actually, the regex should have the end of string anchor:
> array.delete_if { |elem| not elem =~ /.bmp$/i }
>

Also, remember that . is any character, whereas \. is just . for the
sake of getting exactly what you want. !~ looks cleaner to me, but
that's just personal preference in most cases.
--
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Shared Hosting, Reseller Hosting, Dedicated & Semi-Dedicated servers
and Custom Hosting. 24/7 support, 30 day guarantee, secure servers.
Industry's most experienced staff! -- Web Hosting With Muscle!

if you are like me an ignorant of regex, you could try this

array.delete_if { |elem| elem.index_of(".bmp") + 4 = elem.size}
though I don't have an interpreter at the moment, so it hasn't been
tested...

···

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This works fine:

array.select { |item| item =~ /\.bmp/ }

-- Josh
http://iammrjoshua.com

Pierre Pat wrote:

···

if you are like me an ignorant of regex, you could try this

array.delete_if { |elem| elem.index_of(".bmp") + 4 = elem.size}
though I don't have an interpreter at the moment, so it hasn't been
tested...

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