LeetCode: Latest Time By Replacing Hidden Digits Solution

1var maximumTime = function (time) {
2  const fillHour = hh => {
3    let [t1, t2] = hh.split("")
4
5    if (t1 === "?" && t2 === "?") {
6      t1 = "2"
7      t2 = "3"
8    }
9
10    if (t1 === "?") {
11      if (Number(t2) > 3) {
12        t1 = "1"
13      } else {
14        t1 = "2"
15      }
16    }
17
18    if (t2 === "?") {
19      if (Number(t1) <= 1) {
20        t2 = "9"
21      } else {
22        t2 = "3"
23      }
24    }
25
26    return t1 + t2
27  }
28  const fillMin = mm => {
29    let [t1, t2] = mm.split("")
30
31    if (t1 === "?") {
32      t1 = "5"
33    }
34
35    if (t2 === "?") {
36      t2 = "9"
37    }
38
39    return t1 + t2
40  }
41  const [hh, mm] = time.split(":")
42  return fillHour(hh) + ":" + fillMin(mm)
43}