container provides an enhanced version of base R’s list with a
carefully designed set of extract, replace, and remove operations that
make it easier and safer to work with list-like data structures.
- safe and flexible operations to
- extract (built-in default values, no unintended
NULL) - add and replace (mixed indices, no unintended overrides)
- remove (loose or strict deletion, remove by index or value)
- extract (built-in default values, no unintended
- compact printing
- optional reference semantics
In addition, this package provides specialized data structures Deque,
Set and Dict and a special class dict.table, designed to extend
data.table by container
operations to safely Manage data columns with
dict.table.
# Install release version from CRAN
install.packages("container")
# Install development version from GitHub
devtools::install_github("rpahl/container")library(container)
co <- container(colors = c("Red", "Green"), numbers = c(1, 2, 3), data = cars)
co
# [colors = ("Red" "Green"), numbers = (1 2 3), data = <<data.frame(50x2)>>]Safe extract
at(co, "colours") # oops
# Error: index 'colours' not found
at(co, "colors")
# [colors = ("Red" "Green")]Safe remove
co <- delete_at(co, "colours") # oops
# Error: names(s) not found: 'colours'
co <- delete_at(co, "colors")
co
# [numbers = (1 2 3), data = <<data.frame(50x2)>>]Flexible peek
at(co, "colors") # oops
# Error: index 'colors' not found
peek_at(co, "colors")
# []
peek_at(co, "colors", .default = c("black", "white"))
# [colors = ("black" "white")]Safe replace
co <- replace_at(co, num = 1:10) # oops
# Error: names(s) not found: 'num'
co <- replace_at(co, numbers = 1:10)
co
# [numbers = (1L 2L 3L 4L ...), data = <<data.frame(50x2)>>]