Determine if the callbacks have already been called at least once.

.callbacks.fired()🡢 Boolean

Use callbacks.fired() to determine if the callbacks in a list have been called at least once:

// A sample logging function to be added to a callbacks list
var foo = function (value) {
  console.log("foo:" + value);

var callbacks = $.Callbacks();

// Add the function "foo" to the list

// Fire the items on the list"hello"); // Outputs: "foo: hello""world"); // Outputs: "foo: world"

// Test to establish if the callbacks have been called

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