In R how to get an object s name after it is sent to a function

Question

I'm trying to find the opposite of obtain ().

I want to immediately extract the character string that corresponds to an item based on its name.

Simple illustration using foo as a stand-in for the function I'm looking for.

Z is equal to data.frame(x=1:10, y=1:10).

function(a) test

Mean(a$x) = mean.x

print(foo(a))

return(mean.x)}

test(z)

If printed:

"z"

My solution, which is more difficult to put into practise in my current issue, is:

function(a="z") test

Mean(get(a)$x) = mean.x

print(a)

return(mean.x)}

test("z")