Creating implementation for idiom 144 : Check if file exists

Idiom

# 144 Check if file exists

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Lead paragraph

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

Beware that you should not do this and then in the next instruction assume the result is still valid, this is a race condition on any multitasking OS.

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with Ada.Directories;

B : constant Boolean := Ada.Directories.Exists (FP);

#include <unistd.h>
#include <stdbool.h>

bool b = access(_fp, F_OK) == 0

(require '[clojure.java.io :as io])

(.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

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const fs = require('fs');

const b = fs.existsSync(fp);

import { access } from 'fs/promises';

let b = true;
try {
	await access(fp);
} catch {
	b = false;
}

try {
	Deno.statSync(fp)
} catch(_e) {console.error("File does not exist.")}

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)

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let b = std::path::Path::new(fp).exists();

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