how to not hardcode list item name in R?-CodePudding

im pretty new to R, i wonder how can do something like the following:

a = 'vol'
b = list(a=c(1,2,3))

actual output:

> b
$a
[1] 1 2 3

the output that I wish to have:

> b
$vol
[1] 1 2 3

CodePudding user response：

Mid-definition

a = 'vol'
b = setNames(list(c(1,2,3)), a)
b
# $vol
# [1] 1 2 3

The list(.) can have names if you like, they will be overwritten. For instance, this produces the same result: setNames(list(a=c(1,2,3)), a) (the initial name a= is moot, and has nothing to do with the a referenced as the second argument to setNames).

Post-definition

a = 'vol'
b = list(a=c(1,2,3))
names(b) <- a
b
# $vol
# [1] 1 2 3

CodePudding user response：

Use lst from dplyr

library(dplyr)
lst(!! a := c(1, 2, 3))
$vol
[1] 1 2 3