https://en.wikipedia.org/wiki/Hack_(programming_language) https://en.wikipedia.org/wiki/Hack_(programming_language) > Hack allows programmers to use both dynam

https://en.wikipedia.org/wiki/Hack_(programming_language) https://en.wikipedia.org/wiki/Hack_(programming_language) > Hack allows programmers to use both dynamic typing and static typing. This kind of a type system is called gradual typing... I wasn't aware of such a type system, and there're many languages which use both: https://en.wikipedia.org/wiki/Gradual_typing https://en.wikipedia.org/wiki/Gradual_typing