One-liner to recursively list directories in Ruby?

Question

What is the fastest, most optimized, one-liner way to get an array of the directories (excluding files) in Ruby?

How about including files?

Answer 1

Although not a one line solution, I think this is the best way to do it using ruby calls.

First delete all the files recursively
Second delete all the empty directories

Dir.glob("./logs/**/*").each { |file| File.delete(file) if File.file? file }
Dir.glob("./logs/**/*/").each { |directory| Dir.delete(directory) }

Answer 2

In PHP or other languages to get the content of a directory and all its subdirectories, you have to write some lines of code, but in Ruby it takes 2 lines:

require 'find'
Find.find('./') do |f| p f end

this will print the content of the current directory and all its subdirectories.

Or shorter, You can use the ’**’ notation :

p Dir['**/*.*']

How many lines will you write in PHP or in Java to get the same result?

Answer 3

Dir.open(Dir.pwd).map { |h| (File.file?(h) ? "#{h} - file" : "#{h} - folder") if h[0] != '.' }

dots return nil, use compact