JAVASCRIPT

An anonymous function

(function() {
    console.log('Code runs!')
})();

// or

!function() {
  console.log('Code runs!')
}();

anonymous function

//! Button Click Event
//! regular function
document.querySelector("button").addEventListener('click', handlClick);

function handlClick() {
    alert("I got clicked!")//just to show it works
  
  //what to do when click detected
}

//!anonymous function
document.querySelector("button").addEventListener('click',function handlClick() {
    alert("I got clicked!")//just to show it works
  
  //what to do when click detected
});