R - 当名称在变量中时按名称提取列表元素

Question

当名称存储在变量中时，我正在尝试按名称提取列表元素。即:

myList <- list(a = 1, b = 2, c = 3) ## list definition
## I can extract the second element like this:
myList$b
## but say I have a variable:
to_extract <- "b"
##can I do something like this?
myList$to_extract

谢谢!

Answer 1

以下应该都有效。

myList[[to_extract]]

`[[`(myList, to_extract)

library(purrr)
pluck(myList, to_extract)