function array_flip (trans) { // eslint-disable-line camelcase
  //  discuss at: http://locutus.io/php/array_flip/
  // original by: Kevin van Zonneveld (http://kvz.io)
  // improved by: Pier Paolo Ramon (http://www.mastersoup.com/)
  // improved by: Brett Zamir (http://brett-zamir.me)
  //   example 1: array_flip( {a: 1, b: 1, c: 2} )
  //   returns 1: {1: 'b', 2: 'c'}
  var key
  var tmpArr = {}
  for (key in trans) {
    if (!trans.hasOwnProperty(key)) {
      continue
    }
    tmpArr[trans[key]] = key
  }
  return tmpArr
}