Get the previous version of state var about mercury HOT 3 OPEN

If I understand you correctly, you would like to have a history with changes. The observable (hg,state()) does not offer an API for this by default.
In other words, it's up to you to save the data you need, store it and query it the way you want it.

If you project has sufficiently large or complicated dataset, maybe you want to look at something like https://github.com/typeetfunc/datascript-mori/ and https://github.com/tonsky/datascript

If not, well there are lots of options, everything depends on what you want to model.

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Thanks for fast reponse.
So I'm not sure if you familliar with mori.js but there are a lists and I can operate on this object and I would like to ask if it is propery way to use mori and mercury together?

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There are multiple ways to use mori and mercury together, depending on how much you want to experiment with the situation :). You will probably want to replace this https://github.com/Raynos/main-loop/blob/master/index.js with something else. You can check the index.js in mercury where main-loop is used.

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