if-some

macro

since v0.0-2261

imported clojure.core/if-some

Edit

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Details:

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See Also:

• when-some

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Source docstring:

bindings => binding-form test

If test is not nil, evaluates then with binding-form bound to the
value of test, if not, yields else

(defmacro if-some
  {:added "1.6"}
  ([bindings then]
   `(if-some ~bindings ~then nil))
  ([bindings then else & oldform]
   (assert-args
     (vector? bindings) "a vector for its binding"
     (nil? oldform) "1 or 2 forms after binding vector"
     (= 2 (count bindings)) "exactly 2 forms in binding vector")
   (let [form (bindings 0) tst (bindings 1)]
     `(let [temp# ~tst]
        (if (nil? temp#)
          ~else
          (let [~form temp#]
            ~then))))))

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