[R] How do you apply a function to each variable in a data frame?

[zerfetzen]

I want to apply a more complicated function than what I use in my example,
but the idea is the same:

Suppose you have a data frame named x and you want to a function applied to
each variable, we'll just use the quantile function for this example.  I'm
trying all sorts of apply functions, but not having luck.  My best guess
would be:

sapply(x, FUN=quantile)
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