From: yermej <yermej@...>
Date: 2008-05-26T05:34:33+09:00
Subject: Re: A simple newbie question (arrays and strings)

On May 25, 3:17 pm, koichirose <k...@ff.it> wrote:
> Today I started programming in ruby.
> Here's what I managed to do so far:
>
> string = Dir.entries(".")
> string.delete_at(0)
> string.delete_at(0)
>
> 1. I get a list of files
> 2-3. I delete the first two elements ('.' and '..')
>
> Now my files are all like "something - some other thing"
> I want to split them:
>
> string.each do |s|
> puts s.split("-")[0]
> end
>
> So it outputs the "something" part in my filenames.
> Now I'd like to remove duplicate entries (.uniq method right?).
> Can it be done in a single line? If not, how do i get an array
> containing only the "something" part to work on with .uniq?
>
> I tried with some loops, to create a new array with the splitted string
> in it, but my PHP approach doesn't work:
> i = 0
> for i in string
> splitted[i] = i.split("-")[0]
> i += 1
> end
>
> Thank you!

One way would be to use Dir.glob:

unique_array = Dir.glob('*-*').map {|f| f.split('-')[0]}.uniq

Then you only get filenames that have - in them.

Or:

unique_array = Dir.entries('.')[2..-1].map {|f| f.split('-')[0]}.uniq

But starting from here:

> string = Dir.entries(".")
> string.delete_at(0)
> string.delete_at(0)
string.map! {|f| f.split('-')[0]}.uniq!