js $_GET to javascript object

get2obj.js

// рекурсивное преобразование урл параметров в js object

const get2obj = function () {
  let obj = {}
  let gets = location.search.substring(1).split('&')

  for(var i = 0; i < gets.length; i++) {
    let parts = gets[i].split('=')
    let keys = decodeURIComponent(parts.shift()).replace(/\[(.*?)\]/g, '.$1').split(/\./)
    obj = assignValue({...obj}, keys, parts.join('='), 0)
  }

  function assignValue (obj, keys, value, index) {
    let key = keys.shift()
    if (key === '') {
      if (!Array.isArray(obj)) {
        obj = []
      }
      if (keys.length !== 0) {
        obj.push(assignValue({}, keys, value, ++index))
      } else {
        obj.push(value)
      }
    } else {
      if (keys.length !== 0) {
        obj[key] = assignValue(key in obj ? obj[key] : {}, keys, value, ++index)
      } else {
        obj[key] = value
      }
    }
    return obj
  }

  return obj
}