ordered_dict creates an ordered dictionary.
ordered_dict(items = NULL, keys = NULL)a list of items
a list of keys, use names(items) if NULL
Following methods are exposed:
.$set(key, value)
.$get(key, default)
.$remove(key, silent = FALSE)
.$pop(key, default)
.$popitem(last = TRUE)
.$has(key)
.$keys()
.$values()
.$update(d)
.$clear()
.$size()
.$as_list()
.$print()key: scalar character, environment or function
value: any R object, value of the item
default: optional, the default value of an item if the key is not found
d: an ordered_dict object
d <- ordered_dict(list(apple = 5, orange = 10))
d$set("banana", 3)
d$get("apple")
#> [1] 5
d$as_list() # the order the item is preserved
#> $apple
#> [1] 5
#>
#> $orange
#> [1] 10
#>
#> $banana
#> [1] 3
#>
d$pop("orange")
#> [1] 10
d$as_list() # "orange" is removed
#> $apple
#> [1] 5
#>
#> $banana
#> [1] 3
#>
d$set("orange", 3)$set("pear", 7) # chain methods