Anonymous Functions

Also called IIFE (Immediately Invoked Function Expression)

This will create an anonymous function and execute it immediately

(function() { 
    console.log('Anonymous function'); 
})(); 

with Arguments

let person = { 
    firstName: 'David',  
    lastName: 'Smith'  
}; 

(function() { 
    console.log(person.firstName} + ' ' + person.lastName); 
})(person); 

Arrow Functions

(() => { 
  /* ... */ 
})();