Double Down – Rich 4Clojure Problem 15 – See: https://github.com/PEZ/rich4clojure

rich4clojure_elementary_problem_015.clj

(ns rich4clojure.elementary.problem-015
  (:require [hyperfiddle.rcf :refer [tests]]))

;; = Double Down =
;; By 4Clojure user: dbyrne
;; Difficulty: Elementary
;; 
;; Write a function which doubles a number.

(def __ :tests-will-fail)

(comment
  
  )

(tests
  (__ 2) := 4
  (__ 3) := 6
  (__ 11) := 22
  (__ 7) := 14)

;; To participate, fork:
;; https://github.com/PEZ/rich4clojure

;; Post your solution below, please!

;;(def __ (fn [x] (* 2 x)))
;; (def __ #(* 2 %))
;; (def __ (partial * 2))
(def __ (fn double [x] (* 2 x)))

(def __ (fn double-down [n] ((partial * 2) n)))