hashtable-size - get the number of associations in a hashtable
(import (rnrs)) ;R6RS
(import (rnrs hashtables)) ;R6RS
(hashtable-size hashtable)
Returns the number of keys contained in hashtable.
Returns a single value; an exact non-negative integer object.
(map (lambda (n)
(do ((ht (make-eqv-hashtable))
(i 0 (+ i 1)))
((> i n)
(hashtable-size ht))
(do ((j 0 (+ j 1)))
((> j n))
(hashtable-set! ht (* i j) #t))))
'(0 1 2 3 4 5 6 7 8 9 10 11 12 13))
=> (1 2 4 7 10 15 19 26 31 37 43 54 60 73)
This procedure is unique to R6RS. Similar procedures exist in SRFI-69 and
SRFI-125.
This procedure can raise exceptions with the following condition types:
- &assertion (R6RS)
- The wrong number of arguments was passed or an argument was outside its
domain. In particular, hashtable should be a hashtable.
This procedure first appeared in R6RS. An equivalent procedure already existed
in SRFI-69 under the name hash-table-size.