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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 <stdlib.h>
const char * foo = getenv("FOO");
if (foo == NULL) foo = "none";
#include <cstdlib>
#include <string>
const char* tmp = std::getenv("FOO");
std::string foo = tmp ? std::string(tmp) : "none";
string foo = Environment.GetEnvironmentVariable("FOO");
if (string.IsNullOrEmpty(foo)) foo = "none";
foo = System.get_env("FOO", "none")
Foo = os:getenv("FOO","none").
  call get_environment_variable ("FOO", length=n, status=st)
  if (st /= 0) then
    foo = "none"
  else
    allocate (character(len=n) :: foo)
    call get_environment_variable ("FOO", value=foo)
  end if 
import "os"
foo, ok := os.LookupEnv("FOO")
if !ok {
	foo = "none"
}
import "os"
foo := os.Getenv("FOO")
if foo == "" {
	foo = "none"
}
def foo = System.getenv('FOO') ?: 'none'
const foo = process.env["FOO"] || "none";
String foo = System.getenv("foo");
if (foo == null) {
	foo = "none";
}
$foo = getenv("FOO") ?: "none";
sysutils
var
  foo: string;
begin
  foo := GetEnvironmentVariable('FOO');
  if (foo = '') then foo := 'none';
end.
use 5.010;
my $foo = $ENV{FOO} // 'none';
import os
foo = os.environ.get('FOO', 'none')
from os import getenv
foo = getenv('FOO', 'none')
import os
try:
    foo = os.environ['FOO']
except KeyError:
    foo = "none"
foo = ENV["FOO"]
use std::env;
let foo;
match env::var("FOO") {
    Ok(val) => foo = val,
    Err(_e) => foo = "none".to_string(),
}
let foo = env::var("FOO").unwrap_or("none".to_string());
use std::env;
let foo = match env::var("FOO") {
    Ok(val) => val,
    Err(_e) => "none".to_string(),
};
imports System
Dim _foo as String
Try
	foo = Environment.GetEnvironmentVariable("FOO")
Catch ex as Exception
	foo = "none"
End Try