Determine name of last subfolder in a path (Ruby)

soleil 0
Viewed 31

New to Ruby. I'm trying to figure out how to grab the name of a folder. I have this:

path = Dir["#{some_base_path}/*/*"]

Which gives me something like this:

path: ["/tmp/animals/cats/Fluffy"]

What I want is to know the name of the last subfolder - in this case Fluffy.

I've tried variations of Pathname and File.basename, but I always run into no implicit conversion of Array into String (TypeError) errors.

What would be the best way to do this?`

ruby
2 Answers

You already have your path. There is this neat thing in programming languages called Tokenization

You can split a string via a single character or more.

Starting with your array

paths = ["/tmp/animals/cats/Fluffy"]
=> ["/tmp/animals/cats/Fluffy"]

You could take the first element (which is your path string)

path = paths.first
=> "/tmp/animals/cats/Fluffy"

and tokenize it with ruby

tokens = path.split("/")
=> ["", "tmp", "animals", "cats", "Fluffy"]

and then return the last element of the array of "tokens".

tokens.last
=> "Fluffy"
user7O7D0 
# Get array of subdirectories arrays
directories =
  Dir[pattern].
    filter_map { |filename| filename.split("/") if File.directory?(filename) }

# Get maximum subdirectories depth
max_depth = directories.max_by(&:size).size

# Get all subdirectories (tree leaves) with maximum depth
directories.filter_map { |dirs| dirs.last if dirs.size == max_depth }
mechnicov0
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