path.js

if(typeof window !== "undefined"){
    var Gun = window.Gun;
  } else { 
    var Gun = require('gun/gun');
  }
  
  Gun.chain.path = function(field, cb, opt){
      var back = this, gun = back, tmp;
      opt = opt || {}; opt.path = true;
      if(gun === gun._.root){if(cb){cb({err: Gun.log("Can't do that on root instance.")})}return gun}
      if(typeof field === 'string'){
          tmp = field.split(opt.split || '.');
          if(1 === tmp.length){
              gun = back.get(field, cb, opt);
              gun._.opt = opt;
              return gun;
          }
          field = tmp;
      }
      if(field instanceof Array){
          if(field.length > 1){
              gun = back;
              var i = 0, l = field.length;
              for(i; i < l; i++){
                  gun = gun.get(field[i], (i+1 === l)? cb : null, opt);
              }
              //gun.back = back; // TODO: API change!
          } else {
              gun = back.get(field[0], cb, opt);
          }
          gun._.opt = opt;
          return gun;
      }
      if(!field && 0 != field){
          return back;
      }
      gun = back.get(''+field, cb, opt);
      gun._.opt = opt;
      return gun;
  }