docs: function getValues(cmd, args) {
    var step = 0
      , values = []
      , val
      , i = 0;
  
    switch(cmd) {
      // accept single field argument at position 1
      case Constants.MAP.hexists.name:
      case Constants.MAP.hget.name:
      case Constants.MAP.hset.name:
      case Constants.MAP.hsetnx.name:
      case Constants.MAP.hincrby.name:
      case Constants.MAP.hincrbyfloat.name:
        return [this.getKey(args[1])];
      // single step from position 1
      case Constants.MAP.hdel.name:
      case Constants.MAP.hmget.name:
        step = 1;
        break;
      // multiple step from position 1
      case Constants.MAP.hmset.name:
        step = 2;
        break;
    }
  
    if(step === 0) return values;
  
    // return list of value for varargs
    for(;i < args.length;i += step) {
      val = this.getKey(args[i]);
      values.push(val);
    }
    return values;
  }