I often find myself creating a list from several variables, then renaming the list to use those variable names as the name of the list so I can access them with $ notation or use bind_rows with the .id argument:
a <- 1:10
b <- 11:20
mylist <- list(a, b)
names(mylist) <- c("a", "b")
mylist$a
[1] 1 2 3 4 5 6 7 8 9 10
I can’t figure out how to skip this second step and tell R to just use the variable names as the names within the list:
list(a, b)$a
NULL
This seems like it should be doable because it’s the default behavior for data.frame:
data.frame(a, b)$a
[1] 1 2 3 4 5 6 7 8 9 10
but using this method only works if the variables all have exactly the same length. It might seem like a simple thing to just use something like
mylist <- list(a=a, b=b)
but this feels redundant, becomes painful with long variable names, and I’ve often introduced bugs with typos that I don’t notice until later.
Is there a way to construct a list in R from some variables that automatically names the list with the variable names?
>Solution :
We may use dplyr::lst
library(dplyr)
lst(a, b)$a
[1] 1 2 3 4 5 6 7 8 9 10
Or in a chain
lst(a, b) %>%
pluck("a")
[1] 1 2 3 4 5 6 7 8 9 10