functionTypes.as

function doMath( x: Float, y: Float, mathOperation: Float -> Float -> Float ) {
	return mathOperation(x, y);
}

var addition = function(x: Float, y: Float) {
	return x + y;
}

var square = function(x: Float) {
	return x * x;
}

type( doMath ); // Float -> Float -> (Float -> Float -> Float) -> Float 

doMath( 1, 2, addition ); // will return 3
doMath( 1, 2, square ); // compiler error: Float -> Float should be Float -> Float -> Float