public interface Function<F,T>
StringToIntegerFunction may implement
Function<String,Integer> and transform integers in String
format to Integer format.
The transformation on the source object does not necessarily result in
an object of a different type. For example, a
FarenheitToCelciusFunction may implement
Function<Float,Float>.
Implementors of Function which may cause side effects upon evaluation are strongly encouraged to state this fact clearly in their API documentation.
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