Headers in non-C++ OOP Languages -

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i have been wondering while, why non-c++ oop languages (not sure if there other uses headers) doesn't have header files?

well, concerns me in c++ can code class header, , sends mate compile other code against it, while happy coding actual implementation of class on own pace.

how can achieved in languages doesn't have headers? or maybe, there missing in understanding?

how can make class contract other colleagues, both can code in pace? should mock class without implementation methods, mock returns, satisfy need or how?

header files legacy thing time compilers did not have power necessary compile source files without hints developer.

modern languages (and in fact c++ can so, too) use interfaces or base classes implement design-by-contract.


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