and pass in a callback function code example

Example 1: javascript pass function as parameter

//passing a function as param and calling that function
function goToWork(myCallBackFunction) {
    //do some work here
    myCallBackFunction();
}

function refreshPage() {
    alert("I should be refreshing the page");
}

goToWork(refreshPage);

Example 2: javascript callback function

const message = function() {  
    console.log("This message is shown after 3 seconds");
}
 
setTimeout(message, 3000);