Checking if node exists

[hsp_]

Is there a best way to check if exists a node in repository (by the path
and/or by the uuid).
I have a use case that now is trying to load the node, if it is not null
means it exists, otherwise.....
So, I guess that would have a better solution that doesn't need to load all
node, could you help me?
tks
Helio.
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