Problem Description

Clock shows h hours, m minutes and s seconds after midnight.

Your task is to write a function which returns the time since midnight in
milliseconds.

Example:
h = 0
m = 1
s = 1

result = 61000
Input constraints:

0 <= h <= 23
0 <= m <= 59
0 <= s <= 59

Note

• keywords: ->> (thread last)

1 hr = 60 * 60 * 1000 = 3,600,000
1 m =  60 * 1000 = 60,000
1 sec = 1,000

Implementation

(defn past [h m s]
  (->> h
       (* 60)
       (+ m)
       (* 60)
       (+ s)
       (* 1000)))

; (defn past [h m s]
;   (* 1000 (+ (* h 3600) (* m 60) s)))

(defn tester [h m s e]
  (= (past h m s) e))

(comment
  (tester 0 1 1 61000)
  (tester 1 1 1 3661000)
  (tester 0 0 0 0)
  (tester 1 0 1 3601000)
  (tester 1 0 0 3600000))