CodeWars: Objectify A Url Query String Solution

1// Converts a URL Query String into an object map
2function convertQueryToMap(query) {
3  const res = {}
4  const keyValuePairs = query
5    .split("&")
6    .map(kvp => kvp.split("="))
7    .filter(([key]) => Boolean(key))
8  for (const keyValuePair of keyValuePairs) {
9    const [key, value] = keyValuePair
10    const path = key.split(".")
11    let acc = res
12    for (const [i, prop] of path.entries()) {
13      if (i === path.length - 1) {
14        acc[prop] = decodeURIComponent(value)
15        continue
16      }
17      if (!acc[prop]) {
18        acc[prop] = {}
19      }
20      acc = acc[prop]
21    }
22  }
23  return res
24}