(seqable? x)
Return true if the seq function is supported for x
;;;; nil is seqable
(seqable? nil)
;;=> true
;;;; Anything that implements CharSequence is seqable
(seqable? "")
;;=> true
(seqable? (java.lang.StringBuilder.))
;;=> true
(seqable? (java.lang.StringBuffer.))
;;=> true
;;;; Anything that implements Seqable is seqable
(seqable? [])
;;=> true
(seqable? {})
;;=> true
(seqable? #{})
;;=> true
(seqable? '())
;;=> true
(seqable? (lazy-seq))
;;=> true
;;;; Anything that implements Iterable is seqable
(seqable? (java.util.ArrayList.))
;;=> true
(seqable? (java.util.HashMap.))
;;=> true
(seqable? (java.util.HashSet.))
;;=> true
;;;; Arrays are seqable
(seqable? (int-array 5 1))
;;=> true
(seqable? (double-array 5 1.0))
;;=> true
(seqable? (char-array 5 \\c))
;;=> true
;;;; Some stuff that isn't seqable
(seqable? true)
;;=> false
(seqable? \\c)
;;=> false
(seqable? 1)
;;=> false
(seqable? 1.0)
;;=> false
(seqable? (fn f []))
;;=> false