C# Concept	Java	Swift	PHP	Perl	Kotlin	Python	Ruby	JavaScript	Go	Storable in Variable	Storable in Dictionary
Func	Function<T, R>	() -> T	fn() => T	sub { … }	(T) -> R	lambda or def	-> { … }	() => T	func() T	Yes	Yes (Map<String, Function<T,R>>)
Action	Consumer	() -> Void	fn() { }	sub { … }	(T) -> Unit	lambda or def	-> { … }	() => { … }	func(T)	Yes	Yes (Map<String, Consumer>)
delegate	Custom interface or lambda	typealias or closures	Callable	&function_name	typealias + function	def or lambda	Proc.new or lambda	function name or lambda	type MyFunc func() T	Yes	Yes (map[string]MyFunc)