revision algorithms

I am looking for an algorithm to implement a revision system. The data
is quite simple. There is a array of objects. New objects can be
added, objects can be delete, and objects can be moved around in the
array.

I am looking for an effecient way to look at two versions of this list,
capture what changed, and be able to return to init state.

Can anyone point me to any good examples?

.

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