NSTextField is how to achieve Undo Redo function

NSTextField is cut or paste realize how many times can undo and redo it later? To know the cut twice in a row, the last data pasteboard things inside reservations, how to get that data once it before?
Reply:
Memory array ⋯ ⋯
Reply:
Stack can ...
Reply:
You have done redo / undo know.
Not saved in the clipboard. . .