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Functions are of the type Function:
function example():void { }
trace(example is Function); // true
They can be referenced by other variables with the type Function:
var ref:Function = example;
ref(); // ref.call(), ref.apply(), etc.
And they can be passed in as arguments for parameters whose type is Function:
function test(callback:Function):void {
callback();
}
test(function() {
trace('It works!');
}); // Output: It works!
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