Here is a new feature of Unreal Engine 4.22 (UE 4.22) : Live Coding for C++. This means that you can change the C++ code of your project while the game is running and you can re-compile on the fly.
For demonstration I use my Low Poly FPS Kit for UE4 that you can get from here:
https://gumroad.com/l/ue4_low_poly_kit
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Production Music courtesy of Epidemic Sound: http://www.epidemicsound.com