Both of them are OOP. As far as I see, the main difference is that MQL4 does not have a standard library.
What else?
Is there any other big difference between those two?
mql4 actually has a standard library. It's not documented, as, I guess, it's not yet fixed.
There are many topics about the difference between mql4 and mql5 on this site, please do some research.
mql4 actually has a standard library. It's not documented, as, I guess, it's not yet fixed.
There are many topics about the difference between mql4 and mql5 on this site, please do some research.
Both of them are OOP. As far as I see, the main difference is that MQL4 does not have a standard library.
What else?
Is there any other big difference between those two?

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Both of them are OOP. As far as I see, the main difference is that MQL4 does not have a standard library.
What else?
Is there any other big difference between those two?