Simple map for R.
# install.packages("remotes")
remotes::install_github("devOpifex/mapper")
library(mapper)
m <- map()
m$set("key", "value")
m$has("key")
#> [1] TRUE
m$get("key")
#> [1] "value"
m$set("key2", "value 2")
m$ls()
#> [1] "key" "key2"
m$rm("key2")
m$ls()
#> [1] "key"