I want to return a data.frame from a function if TRUE, else return NA using return(ifelse(condition, mydf, NA))

However, ifelse strips the column names from the data.frame.

Why are these results different?

> data.frame(1)
  X1
1  1
> ifelse(TRUE, data.frame(1), NA)
[[1]]
[1] 1

Some additional insight from dput():

> dput(ifelse(TRUE, data.frame(1), 0))
list(1)
> dput(data.frame(1))
structure(list(X1 = 1), .Names = "X1", row.names = c(NA, -1L), 
          class = "data.frame")
class function r if-statement
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