为什么错误处理重要点击我

现在让我们看看为什么在Observables中需要进行错误处理..

示例：

  this.service.send（this.shareData）.subscribe（（）=> {

 //这里你确定发送有共享数据sucessFully 

}，（error）=> {

 / *现在如果你想处理错误像前端错误和记录这个
在你的backEnd DB所以解决它并修复它* / 

 / *下面的示例检查错误类型是从frontEnd和日志错误通过Api * / 

 if（error.type ！=='API'）{
 this.logService.log（{
级别：2，
消息：'无法设置FromDB'，
}）; 
} 
}）; 
 

I have found myself working with code from themes written in latest Angular versions and searching the web, and I have found that the most part of devs don't handle the subscription error.

My question is: When do I have to handle the error in an Observable subscription?

Without error handling:

    this.myService.observable$.subscribe(
        (data) => {
            // do stuff with data
        }
    );

With error handling:

    this.myService.observable$.subscribe(
        (data) => {
            // do stuff with data
        },
        err => {
            // do stuff with error
        }
    );

I mostly find the first version, but...

Isn't an issue not to handle the errors of a subscription?

Doesn't this make the code less solid, testable and more prone to fail?

why is error handling important click Me

Now Lets see Why error handling is necessary in Observables..

Example:

this.service.send(this.shareData).subscribe(() => {

      // Here you are sure that the send has shared the data sucessFully

    }, (error) => {

      /* Now If you want to handle errors Like Front End Errors and Log this
         In your backEnd DB So solve it and fix it */

      /* Example below check error type is It from frontEnd and log error through Api */

      if(error.type !== 'API') {
        this.logService.log({
          Level: 2,
          Message: 'Failed to setFromDB',
        });
      }
    });