Nice feature of Lisp is also in JavaScript

gistfile1.txt

; Lisp
(defun generate-counter ()
  (let ((memory 0))
    (lambda () (incf memory))))

CG-USER(1): (setq fn (generate-counter))
CG-USER(2): (funcall fn)
1
CG-USER(3): (funcall fn)
2
CG-USER(4): (funcall fn)
3



// JavaScript
function generateCounter(){
  var memory = 1;
  return function(){
    return memory++;
  }
}

var fn = generateCounter();
> fn()
  1
> fn()
  2
> fn()
  3

And also in PHP :)

function generateCounter() {
    $memory = 1;
    return function () use (&$memory) {
        return $memory++;
    }
}

$gen = generateCounter();
echo $gen(); // 1
echo $gen(); // 2
echo $gen(); // 3

;)

Nice ^_^ 👍