Ruby select filename from array of filenames

Question

I have an array of filenames in ruby. I want to select the filename that contains a specific string in it

for example

array = ["/some/place/once.txt", "/some/place/two.txt","/some/place/three.txt"]

and i want to select only the filename that has the word "two" in it

so I want to get filename = array.select { |e| e.include? "two" }

but for some reason filename contains everything that is in array. How to make it work?

It should work, and I can't reproduce your problem. What else is there between setting filename and checking filename? — Schwern
– Schwern, Commented Jul 13, 2020 at 18:27
nothing, i have the array first line (i receive it as a parameter) and the filename selection second line — Lena Bru
– Lena Bru, Commented Jul 13, 2020 at 18:45
Lena, try copy pasting in the code from your question into a new IRB console. You will see that it produces the expected result. Therefore there must be something else going on in your code that you're not showing us. — max pleaner
– max pleaner, Commented Jul 13, 2020 at 18:51
Do you want the file name and not the entire dir path? If so: array.select { |e| e.include? "two" }.map { |p| p.split("/").last } Otherwise your code seems to be working — benjessop
– benjessop, Commented Jul 13, 2020 at 19:09
@maxpleaner it ended up being cursive " that was causing the issue. — Lena Bru
– Lena Bru, Commented Aug 4, 2020 at 14:02

tadman · Accepted Answer · 2020-07-13 20:13:00Z

1

Given this data:

array = ["/some/place/once.txt", "/some/place/two.txt","/some/place/three.txt"]

You can always find all matching entries with grep and just take the first:

array.grep(/two/).first
# => ["/some/place/two.txt"]

Or you can always scan using find:

array.find { |s| s.include?('two') }
# => "/some/place/two.txt"

Using select should produce an array result of all matches, but is otherwise identical. Your behaviour cannot be reproduced.

answered Jul 13, 2020 at 20:13

tadman

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