All About E: A Language That Infiltrated JavaScript(thenewstack.io)

    const incfac = () => { let n = 0; return m => (m > 0 ? n += m : n) };

    (define (mocntr) (let ((x 0)) (cons (lambda () (let ((yet #t))
         (lambda () (if yet (begin (set! yet #f) (set! x (+ 1 x)) x)))))
      (lambda () x))))
    (define lunchcrowd (list (lambda (x) (write (cons "for Bill" x)))
       (lambda (x) (write (cons "for Bob" x))
              ((cdr (assoc "Mandarin" (cdr x)))))))
    (define restaurants (list "Mandarin" "Casa Lupe" "Coffee Shop"))
    (define (noontime) (let ((bb
           (map (lambda(r) (cons r (mocntr))) restaurants)))
        (for-each (lambda (e) (e (cons "Lunchtime!" (map
          (lambda(r)(cons (car r) ((cadr r)))) bb)))) lunchcrowd)
        (lambda ()(map (lambda(x) (cons (car x) ((cddr x)))) bb))))

    const t = Object.freeze({foo: "bar"});
    // throws an error in strict mode,
    // silently does nothing otherwise
    t.foo = "baz";
    // prints "bar"
    console.log(t.foo);

    const t2 = Object.freeze({foo: {bar: "baz"}}); 
    // bar is still mutable
    t2.foo.bar = "oh no!";
    // prints "oh no!"
    console.log(t2.foo.bar);