clojure.core/bit-test

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

([x n])

Test bit at index n

Examples

by zmila on 2010-07-28 ▶

(bit-test 2r1001 0) ;;=> true (bit-test 2r1001 1) ;;=> false (bit-test 2r1001 7) ;;=> false

by pauloaug on 2019-02-13 ▶

;; Note that the index starts from the least significant bit (right to left). (map #(bit-test 2r10011 %) [0 1 2 3 4]) ;;=> (true true false false true)

by reborg on 2019-07-30 ▶

;; bit-wise powerset (set of all subsets) (defn powerset [coll] (let [cnt (count coll) bits (Math/pow 2 cnt)] (for [i (range bits)] (for [j (range i) :while (< j cnt) :when (bit-test i j)] (nth coll j))))) (powerset [1 2 3]) ;; (() (1) (2) (1 2) (3) (1 3) (2 3) (1 2 3))

See also

• clojure.core/bit-set (2)
• clojure.core/bit-shift-left (2)
• clojure.core/bit-xor (2)

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