(function () {

  var arr = [55, 21, 807, 41, 56, 66, 202];

  var num = 4;

  var str = "Lorem ipsum";

  var bool = true;

  var nil = null;

  console.log(arr, num, str, bool, nil);

​

})();

​

(function () {

  let arr = [55, 21, 807, 41, 56, 66, 202];

  let num = 4;

  let str = "Lorem ipsum";

  let bool = true;

  let nil = null;

  console.log(arr, num, str, bool, nil);

​

})();

​

​

(function () {

  const arr = [55, 21, 807, 41, 56, 66, 202];

  const num = 4;

  const str = "Lorem ipsum";

  const bool = true;

  const nil = null;

  console.log(arr, num, str, bool, nil);

​

})();

​