clojure.core/next

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Type: function Added: Clojure 1.0 Examples: 3 Runnable: 2

([coll])

Returns a seq of the items after the first. Calls seq on its argument. If there are no more items, returns nil.

Examples

by dpritchett on 2010-07-14 . May have evaluation errors. ▶

(next '(:alpha :bravo :charlie)) (:bravo :charlie) (next (next '(:one :two :three))) (:three) (next (next (next '(:one :two :three)))) nil

by boxie on 2010-11-06 ▶

;; next is used in the recursive call. (This is a naive implementation for illustration only. Using `rest` is usually preferred over `next`.) (defn my-map [func a-list] (when a-list (cons (func (first a-list)) (my-map func (next a-list)))))

by Dimagog on 2015-02-04 ▶

;; Difference between next and rest: (next [:a]) ;; => nil (rest [:a]) ;; => () (next []) ;; => nil (rest []) ;; => () (next nil) ;; => nil (rest nil) ;; => ()

Note by steveminer

(next aseq) === (seq (rest aseq))

When writing lazy sequence functions, you should use rest, not next.

See also

• clojure.core/rest (6)
• clojure.core/first (2)
• clojure.core/fnext
• clojure.core/nthrest (4)
• clojure.core/nthnext (2)

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