(some? x)
Returns true if x is not nil, false otherwise.
user> (some? nil)
;; => false
user> (some? 42)
;; => true
user> (some? false)
;; => true
user> (some? [])
;; => true
user> (some? {})
;; => true
user> (some? '())
;; => true
;; equivalent to implementing not-nil?
(some? :kw)
;; => true
(not (nil? :kw))
;; => true
(some? nil)
;; => false
(not (nil? nil))
;; => false