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Programming-Idioms

New implementation

Be concise.

Be useful.

All contributions dictatorially edited by webmasters to match personal tastes.

Please do not paste any copyright violating resource.

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

Other implementations
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
int err = 0;
int fd = 0;
void * ptr = NULL;
struct stat st;
if ((fd = open (f, O_RDONLY))
&& (err = fstat (fd, &st)) == 0
&& (ptr = mmap (NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0)) != -1) {
    const char * lines = ptr;
    puts (lines);
    munmap (ptr, st.st_size);
    close (fd);
}
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
FILE *file;
size_t len=0;
char *lines;
assert(file=fopen(f,"rb"));
assert(lines=malloc(sizeof(char)));

while(!feof(file))
{
	assert(lines=realloc(lines,(len+0x1000)*sizeof(char)));
	len+=fread(lines,1,0x1000,file);
}

assert(lines=realloc(lines,len*sizeof(char)));
(def lines (slurp f))
#include <sstream>
std::string fromFile(std::string _f)
{
    std::ifstream t(_f);
    t.seekg(0, std::ios::end);
    size_t size = t.tellg();
    std::string buffer(size, ' ');
    t.seekg(0);
    t.read(&buffer[0], size); 
}
System.IO;
string lines = File.ReadAllText(f);
import std.file;
string lines = cast(string) read(f, size_t.max);
import std.file;
auto lines = f.readText;
import "dart:io";
var lines = new File(f).readAsStringSync();
lines = File.read!(f)
{ok, Lines} = file:read_file(F).
program p
   character(len=:),allocatable :: s
   open(unit=10,file='myfile',access='stream')
   inquire(10,size=i)
   allocate(character(len=i) :: s)
   read(10)(s(j:j),j=1,i)
   write(*,*)s
end program p
import "io/ioutil"
b, err := ioutil.ReadFile(f)
if err != nil {
	// Handle error...
}
lines := string(b)
do lines <- readFile f; putStr lines
var fs = require('fs');
fs.readFile(f, (err, lines) => {
    if (err) {
        // Handle error...
    }

    // Work with `lines` here.
}
import java.nio.file.Files;
import java.nio.charset.StandardCharsets;
byte[] encoded = Files.readAllBytes(Paths.get(f));
String lines = new String(encoded, StandardCharsets.UTF_8);
import java.io.File
File(f).readText()
lines = io.input(f):read('a')
@import Foundation;
NSString *lines=[NSString stringWithContentsOfFile:f encoding:e error:NULL];
$lines = file_get_contents('f');
if ($lines === false) {
    // handle error...
}
Classes
var
 _lines, _f: String;
 SL: TStringList;
begin
  SL := TStringList.Create;
  SL.LoadFromFile(_f);
  _lines := SL.Text;
  SL.Free;
end;
my $lines = do { local $/; <$FH> };
with open(f) as fo:
    lines = fo.read()
lines = open(f).read()
lines = File.read(f)
use std::io::prelude::*;
use std::fs::File;
let mut file = File::open(f)?;
let mut lines = String::new();
file.read_to_string(&mut lines)?;
use std::fs;
let lines = fs::read_to_string(f).expect("Can't read file.");
import scala.io.Source
val lines = Source.fromFile(filename).getLines().mkString("\n")
Dim lines = IO.File.ReadAllText(f)