dict | R Documentation |
dict
creates an ordinary (unordered) dictionary (a.k.a. hash).
dict(items = NULL, keys = NULL)
items |
a list of items |
keys |
a list of keys, use |
Following methods are exposed:
.$set(key, value) .$get(key, default) .$remove(key, silent = FALSE) .$pop(key, default) .$has(key) .$keys() .$values() .$update(d) .$clear() .$size() .$as_list() .$print()
key
: a scalar character, an atomic vector, an enviroment or a function
value
: any R object, value of the item
default
: optional, the default value of an item if the key is not found
d
: a dict object
ordered_dict
d <- dict(list(apple = 5, orange = 10))
d$set("banana", 3)
d$get("apple")
d$as_list() # unordered
d$pop("orange")
d$as_list() # "orange" is removed
d$set("orange", 3)$set("pear", 7) # chain methods
# vector indexing
d$set(c(1L, 2L), 3)$set(LETTERS, 26)
d$get(c(1L, 2L)) # 3
d$get(LETTERS) # 26
# object indexing
e <- new.env()
d$set(sum, 1)$set(e, 2)
d$get(sum) # 1
d$get(e) # 2
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