如何通过在组件内部订阅变量来从可观察值存储值-Angular4

Question

I am trying to store value from observable to a variable inside the component using a service however it always has the value of undefined. "names" inside subscribe contains value as expected.

 this.dataClient.obsNames.subscribe(names => { this.names = names; //declared above as public names = []; }); 

Answer 1

What i think you have print this.names on console outside of subscribe.which is asynchronous method.due to which your getting undefined.

Try this:

 `this.dataClient.obsNames.subscribe(names =>{ 
      this.names = names;
      console.log(this.names);
  });`