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  • Dart

Idiom #177 Find files for a list of filename extensions

Construct a list L that contains all filenames that have the extension ".jpg" , ".jpeg" or ".png" in directory D and all its subdirectories.

import 'dart:io';
import 'package:path/path.dart' as p;
var extensions = [".jpg", "jpeg", ".png"];
var L = Directory(D)
    .listSync(recursive: true)
    .where((file) => extensions.contains(p.extension(file.path)))
    .toList();

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
string D = @"C:\The\Search\Path";

// Assumes that the file system is case insensitive
HashSet<string> exts = new HashSet<string>(StringComparer.CurrentCultureIgnoreCase) { "jpg", "jpeg", "png" };
IEnumerable<string> L =
Directory
    .EnumerateFiles(D, "*", SearchOption.AllDirectories)
    .Where(currentFile => exts.Contains(Path.GetExtension(currentFile)));

Enumerating all files under the given directory select any file whose extension exists in the HashSet (case insensitive using the current culture). If you want this to be case sensitive you can remove the comparer.
New implementation...
< > ⌨
Bart 
var extensions = [".jpg", "jpeg", ".png"];
var L = Directory(D)
    .listSync(recursive: true)
    .where((file) => extensions.contains(p.extension(file.path)))
    .toList();

string D = @"C:\The\Search\Path";

// Assumes that the file system is case insensitive
HashSet<string> exts = new HashSet<string>(StringComparer.CurrentCultureIgnoreCase) { "jpg", "jpeg", "png" };
IEnumerable<string> L =
Directory
    .EnumerateFiles(D, "*", SearchOption.AllDirectories)
    .Where(currentFile => exts.Contains(Path.GetExtension(currentFile)));
immutable exts = ["jpg", "jpeg", "png"];
auto L = D.dirEntries(SpanMode.depth)
          .map!(to!string)
          .filter!(f => exts.canFind(f.split(".")[$-1]));
L := []string{}
err := filepath.Walk(D, func(path string, info os.FileInfo, err error) error {
	if err != nil {
		fmt.Printf("failure accessing a path %q: %v\n", path, err)
		return err
	}
	for _, ext := range []string{".jpg", ".jpeg", ".png"} {
		if strings.HasSuffix(path, ext) {
			L = append(L, path)
			break
		}
	}
	return nil
})
static List<String> L = new ArrayList<>();
record Find(File d, String ... t) {
    Find { get(d, t); }
    void get(File d, String ... t) {
        File a[] = d.listFiles();
        if (a == null) return;
        for (File f : a)
            if (f.isDirectory()) get(f, t);
            else for (String s : t)
                if (f.getName().endsWith('.' + s)) {
                    L.add(f.getAbsolutePath());
                    break;
                }
    }
}
L := FindAllFiles(D, '*.jpg;*.jpeg;*.png', True);
my @L;
find(sub {
  push @L, $File::Find::name
     if /(.jpg|.jpeg|.png)$/;
}, $D);



extensions = [".jpg", ".jpeg", ".png"]
L = [f for f in os.listdir(D) if os.path.splitext(f)[1] in extensions]

filtered_files = ["{}/{}".format(dirpath, filename) for dirpath, _, filenames in os.walk(D) for filename in filenames if re.match(r'^.*\.(?:jpg|jpeg|png)$', filename)]
list(itertools.chain(*(glob.glob("*/**.%s" % ext) for ext in ["jpg", "jpeg", "png"])))
extensions = [".jpg", ".jpeg", ".png"]
L = [f for f in glob.glob(os.path.join(D, "**/*"), recursive=True) if os.path.splitext(f)[1] in extensions]
L = Dir.glob(File.join("**", "*.{jpg,jpeg,png}"), base: D)
let d = Path::new("/path/to/D");
let l: Vec<PathBuf> = d
    .read_dir()?
    .filter_map(|f| f.ok())
    .filter(|f| match f.path().extension() {
        None => false,
        Some(ex) => ex == "jpg" || ex == "jpeg" || ex == "png"
    })
    .map(|f| f.path())
    .collect();