r - 将数据框通过管道传递给一个函数，该函数的参数通过管道传递一个点

Question

如何将数据帧传送到其参数传送点的函数？

mpg %>% rbind(., . %>% rev())

Error in rep(xi, length.out = nvar) : attempt to replicate an object of type 'closure'

另一个例子:

mpg %>%
  {
    . %>% arrange(manufacturer)
  }

Functional sequence with the following components:

1. arrange(., manufacturer)

Use 'functions' to extract the individual functions.

Answer 1

将要通过管道传输的点括在括号中，例如 (.):

mpg %>% rbind(., (.) %>% rev())

或者，对于 lambda 函数:

mpg %>%
  {
    (.) %>% arrange(manufacturer)
  }