length()
Returns the number of key-value pairs in the hash.
h = { "d" => 100, "a" => 200, "v" => 300, "e" => 400 } h.length #=> 4 h.delete("a") #=> 200 h.length #=> 3
VALUE rb_hash_size(VALUE hash) { return INT2FIX(RHASH_SIZE(hash)); }