func getFunction(name string) (*Function, bool) {
	function, ok := functions[name]
	return function, ok
}
func getFunction(name string) (*Function, bool) {
	function, ok := functions[name]
	return function, ok
}
func getFunction ( name string ) ( * Function , bool ) { function , ok := functions [ name ] return function , ok }
// getFunction returns a predefined Function object for the given name.
getFunction returns a predefined Function object for the given name .