Logo

Programming-Idioms

Set boolean b to true if file at path fp exists on filesystem; false otherwise.

Beware that you should never do this and then in the next instruction assume the result is still valid, this is a race condition on any multitasking OS.
New implementation

Be concise.

Be useful.

All contributions dictatorially edited by webmasters to match personal tastes.

Please do not paste any copyright violating material.

Please try to avoid dependencies to third-party libraries and frameworks.

Other implementations
with Ada.Directories;
B : constant Boolean := Ada.Directories.Exists (FP);
#include <unistd.h>
#include <stdbool.h>
bool b = (access(_fp, F_OK) == 0) ? true : false;
(require '[clojure.java.io :as io])
(let [b (.exists (io/file fp))]
  ;
)
#include <filesystem>
bool b = std::filesystem::exists(fp);
bool b = File.Exists(fp);
import std.file;
bool b = fp.exists;
import 'dart:io';
var b = await File(fp).exists();
inquire (file=fp,exist=b)
import "os"
_, err := os.Stat(fp)
b := !os.IsNotExist(err)
import System.Directory
b = doesFileExist fp
import { access } from 'fs/promises';
let b = true;
try {
	await access(fp);
} catch {
	b = false;
}
const fs = require('fs');
const b = fs.existsSync(fp);
import java.io.File;
boolean b = new File(fb).exists();
import java.io.File;
b = File(fb).exists()
$b = file_exists($fp);
uses sysutils;
b := FileExists(fp);
my $b = -f $fp;
from pathlib import Path
b = Path(fp).exists()
import os
b = os.path.exists(fp)
b = File.exist?(fp)
let b = std::path::Path::new(fp).exists();