clojure.core/some->

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Type: macro Added: Clojure 1.5 Examples: 2 Runnable: 0

([expr & forms])

When expr is not nil, threads it into the first form (via ->), and when that result is not nil, through the next etc

Examples

by boxp on 2014-10-09 . May have evaluation errors. ▶

(-> {:a 1} :b inc) ;; NullPointerException clojure.lang.Numbers.ops (Numbers.java:942) (some-> {:a 1} :b inc) ;; nil

by marick on 2015-10-13 . May have evaluation errors. ▶

;; Often used to "short-circuit out" of a series of steps: (some-> val step1 step2 step3) ;; When nil is returned by any step, the further steps are not executed. Thus ;; the nil case need be handled only once, at the end.

See also

• clojure.core/some->>
• clojure.core/-> (4)
• clojure.core/cond-> (4)
• clojure.core/cond->>
• clojure.core/as-> (4)
• clojure.core/->> (7)

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