JavaScript Multiple Callback Function

wouldn't this work:

function callback(f1, f2) {
    f1();
    f2();
}

As for passing arguments, be creative.

function1 = (callback1, callback2, callback3) => {
  setTimeout(() => {
    console.log("function 1 timed out!");
    callback1(callback2, callback3);
  }, 1500);
}

function2 = (callback1, callback2) => {
  setTimeout(() => {
    console.log("function 2 timed out!");
    callback1(callback2);
  }, 1500);
}

function3 = (callback1) => {
  setTimeout(() => {
    console.log("function 3 timed out!")
    callback1()
  }, 1500);
}

function4 = () => {
  setTimeout(() => {
    console.log("function 4 timed out!")
  }, 1500);
}

function1(function2, function3, function4);

Just pass down the callbacks from the first function and execute each one, passing down the rest.

OUTPUT

function 1 timed out!
function 2 timed out!
function 3 timed out!
function 4 timed out!

To accomplish this, you need to pass the next callback into each function.

function printList(callback) {
  // do your printList work
  console.log('printList is done');
  callback();
}

function updateDB(callback) {
  // do your updateDB work
  console.log('updateDB is done');
  callback()
}

function getDistanceWithLatLong(callback) {
  // do your getDistanceWithLatLong work
  console.log('getDistanceWithLatLong is done');
  callback();
}

function runSearchInOrder(callback) {
    getDistanceWithLatLong(function() {
        updateDB(function() {
            printList(callback);
        });
    });
}

runSearchInOrder(function(){console.log('finished')});

This code outputs:

getDistanceWithLatLong is done
updateDB is done
printList is done
finished