[R] re order vector in order given by another vector

[jimineep]

So imagine I have a vector:

zz = c("a","c","d","b")

and another vector:

xx = c("d","c","a","b")

I need to get xx in the same order as zz. I am sure this is very simple but
I can't figure it out from the help pages for order or sort. Perhaps I'm not
trying hard enough but its been bugging me for a while.... Can anyone help?
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