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Programming-Idioms

  • JS
  • Ruby
  • Python
  • Go
  • Elixir

Idiom #273 Check if folder is empty

Set the boolean b to true if the directory at filepath p is empty (i.e. doesn't contain any other files and directories)

def main(p) do
  b = File.ls!(p) == []
end
b = Dir.empty?(p)

Returns true if the named file is an empty directory, false if it is not a directory or non-empty.
import os
b = os.listdir(p) == []
import "os"
dir, err := os.Open(p)
if err != nil {
	panic(err)
}
defer dir.Close()
_, err = dir.Readdirnames(1)
b := err == io.EOF

Error may happen, and should be dealt with.

b is set to true if EOF was encountered before reading 1 contained file name.
import 'dart:io';
var b = await Directory(p).list().isEmpty;
New implementation...
< > ⌨
programming-idioms.org 
def main(p) do
  b = File.ls!(p) == []
end
b = Dir.empty?(p)
b = os.listdir(p) == []
dir, err := os.Open(p)
if err != nil {
	panic(err)
}
defer dir.Close()
_, err = dir.Readdirnames(1)
b := err == io.EOF
var b = await Directory(p).list().isEmpty;
boolean b = p.list().length == 0;
(let ((b (directory p)))
  (if (null b) t nil))
$iterator = new FilesystemIterator($p, FilesystemIterator::SKIP_DOTS);
$b = (iterator_count($iterator) === 0);
with FindAllFiles(p, AllFilesMask, False) do
try
  b := DirectoryExists(p) and (Count = 0);
finally
  Free;
end;

opendir(my $dh, $p) || die($!);
my $b = scalar(grep { !/^[\.]{1,2}$/ } readdir($dh)) ? 1 : 0;
closedir($dh);
let b = fs::read_dir(p).unwrap().count() == 0;