Parentheses in IIFE in JavaScript

Normally, parentheses are used instead of plus when calling a function in-place, because this style is considered more obvious:

javascript(function() {
  console.log('!');
}());

Most often, the parentheses of a function call are placed outside, like this:

javascript(function() {
  console.log('!');
})();

Задание 1

Determine what will be output to the console without running the code:

javascriptlet result = (function() {
  return '!';
}());

console.log(result);

Задание 2

Determine what will be output to the console without running the code:

javascriptlet result = (function() {
  return '!';
})();

console.log(result);

Задание 3

Determine what will be output to the console without running the code:

javascriptlet result = (function() {
  return '!';
});

console.log(result);

Задание 4

Determine what will be output to the console without running the code:

javascriptlet result = (function() {
  return '!';
});

console.log(result());