Last data update: 2014.03.03
|
R: Test for existence of key(s) on a hash
Test for existence of key(s) on a hash
Description
has.key returns a logical vector as long as keys , indicating
which keys are defined on the hash.
Usage
has.key(key, hash, ...)
Arguments
key |
A vector whose entries will be coerced to valid keys.
|
hash |
A hash object.
|
... |
arguments passed to further functions
|
Details
None.
Value
logical |
A logical vector of length key indicating whether the key is
defined in the hash. has.key also accepts ...
to be passed to underlying sapply
|
Author(s)
Christopher Brown
See Also
See also hash
Examples
h <- hash( letters, 1:26 )
all( has.key( letters, h ) ) # TRUE
Results
|