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Test if a hash has no key-value pairs.

is.empty.Rd

is.empty tests to see if any key value pairs are assigned on a hash object.

Usage

is.empty(x)

Arguments

x

hash object.

Details

Returns TRUE if no key-value pairs are defined for the hash, FALSE otherwise.

Value

logical.

Author

Christopher Brown.

See also

exists.

Examples

    h <- hash( a=1, b=2, c=3 )
    is.empty(h)    # FALSE
#> [1] FALSE
    clear(h)
    is.empty(h)    # TRUE
#> [1] TRUE
    h <- hash()
    is.empty(h)    # TRUE
#> [1] TRUE