text: 
  export default function findPath(obj) {
    let res = ''
    for (const key in obj) {
      if (obj[key] === 15) res = key
      if (typeof obj[key] === 'object') {
        if (res = findPath(obj[key])) {
          res = key + '.' + res
        }
      }
    }
    return res || null
  }
  