string to nested object

gistfile1.txt

var plain = {
'data.analytics.name': 'coehn',
'data.analytics.role': 'ninja'
}

var converted = function (plainObj) {
  var converted = {}
  for (var plainKey in plainObj) {
    var nextStep = converted
    var splitted = plainKey.split('.')
    for (var i in splitted) {
      var level = splitted[i]
      nextStep[level] = nextStep[level] || {}
      if (i == splitted.length - 1 ) {
        nextStep[level] = plainObj[plainKey]
      } else {
        nextStep = nextStep[level]
      }
    }
  }
  return converted
} 

console.log(JSON.stringify(converted(plain), null, 2));