Key existence in hash tables

Source: R/generics.R, R/hashmap.R, R/hashset.R

This generics are used to check whether a key exists in a given hashset or hashmap.

has_key(x, key)

x %has_key% key

# S3 method for class 'r2r_hashmap'
has_key(x, key)

# S3 method for class 'r2r_hashset'
has_key(x, key)

Arguments

x

an hashset or hashmap.

key

an arbitrary R object. Key to be checked for existence in the hash table.

Value

TRUE or FALSE.

Author

Valerio Gherardi

Examples

m <- hashmap(list("a", 1), list("b", 2))
has_key(m, "a")
#> [1] TRUE
m %has_key% "b"
#> [1] TRUE