Callback functions

Callback functions

function ask(question, yes, no) {
  if (confirm(question)) yes()
  else no();

function showOk() {
  alert( "You agreed." );

function showCancel() {
  alert( "You canceled the execution." );

// usage: functions showOk, showCancel are passed as arguments to ask
ask("Do you agree?", showOk, showCancel);

The idea is that we pass a function and expect it to be "called back" later if necessary. In our case, showOk becomes the callback for the "yes" answer, and showCancel for the "no" answer.

Related concepts

Callback functions

Callback functions — Structure map

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Callback functions — Related pages: