High-level functions for hash tables

Usage

hash_table_keys(h)

hash_table_values(h)

# S3 method for class 'hash_table'
x[[i]]

# S3 method for class 'hash_table'
x[i]

# S3 method for class 'hash_table'
x$name

# S3 method for class 'hash_table'
x[[i]] <- value

# S3 method for class 'hash_table'
x[i] <- value

# S3 method for class 'hash_table'
x$name <- value

# S3 method for class 'hash_table'
length(x)

# S3 method for class 'hash_table'
print(x, ...)

Arguments

h, x: A hash_table object.
i, name: A single or a vector of character keys.
value: The corresponding values.
...: Other arguments.

Value

hash_table_keys() returns a vector of all keys.
hash_table_values() returns a vector of all values.
[[ or $ returns a single value.
[ returns a vector of values.

Details

For [ and [<- methods, multiple keys are allowed.

For the assignment, when the values in the hash table are not R object, if the assigned value is NULL, the corresponding key-value pair is deleted.

Examples

h = hash_table(c("a", "b"), 1:2L)
hash_table_keys(h)
#> [1] "b" "a"
hash_table_values(h)
#> [1] 2 1
h[["a"]]
#> [1] 1
h$a
#> [1] 1
h[c("a", "b")]
#> [1] 1 2
h[["a"]] = 10L
h[["a"]]
#> [1] 10
h$a = 100L
h$a
#> [1] 100
length(h)
#> [1] 2
h = hash_table(c("a", "b"), 1:2L)
h$a = NULL
h
#> A hash table with 1 key-value (integer) pair
#>   b => 2