I have implemented a simple BehaviorSubject
,
import {BehaviorSubject} from "rxjs";
class MyWeirdoClass {
constructor() {}
private st: Subject<boolean> = new BehaviorSubject<boolean>(null);
changeSt(val:boolean){
this.st.next(val);
}
val(){
this.st.subscribe(res=>{
if (res){
console.log(res);
}
})
}
stStatus() {
this.val();
this.changeSt(true);
this.val();
this.changeSt(false);
this.val();
}
}
now when running stStatus()
gives logs the following output on the console.
true
true
while I expect the value
false
true
false
What is wrong with my implementation?
The output you're getting is correct:
this.val();
This just makes the first subscription which doesn't print anything thanks to if (res) {...}
.
this.changeSt(true);
Set's the value to true
which is printed by the first subscription.
this.val();
Makes the second subscription which prints the second true
.
this.changeSt(false);
You set it to false
which is ignored by all subscribers because of if (res) {...}
.
this.val();
The same as above.