JavaScript executes functions immediately in three different ways

The first:

(function () { // open IIFE 
// inside IIFE 
}()); // close IIFE

The second:

!function () { // open IIFE 
// inside IIFE 
}(); // close IIFE

The third:

void function () { // open IIFE 
// inside IIFE 
}(); // close IIFE