setItemWithKey.js

setItemWithKey(key,obj){
    return new Promise((resolve,reject)=>{
      // count object example
      // obj = {
      //   action : 1 || 0,
      //   time,
      // }
      this.getItems().then((data)=>{
        if(obj.action === 1){
          data[key].count++;
        }else{
          data[key].count--;
        }
        data[key].counts.push(obj);
        AsyncStorage.setItem('count', JSON.stringify(data), (err,result) => {
          if(err){
            reject({err:'something went wrong!'});
          }else{
            resolve(true);
          }
        });
      }) 
    })
  }