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@ssougnez

ssougnez/wamr-100.ts

Created Mar 13, 2021
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import { Observable, of, throwError } from 'rxjs';
import { catchError, finalize, map } from 'rxjs/operators';
const observable = new Observable<number>(observer => {
let x = 0;
const interval = setInterval(() => {
if (x === 0) {
observer.error('Oops');
}
else {
observer.next(x++);
}
}, 1000);
return {
unsubscribe: () => clearInterval(interval)
}
});
observable
.pipe(
catchError(() => {
console.warn('Looks like 5 has been emitted...') ;
return of(0);
}),
map(x => {
const a: string = null;
const b = a.substring(1, 2);
return parseInt(b);
}),
catchError(err => {
console.warn("OMG, I'm so unlucky");
return throwError(err);
}),
finalize(() => console.log('Cleaning up...'))
)
.subscribe({
next: x => console.log(`${x} received`),
complete: () => console.log('Completed'),
error: err => console.warn(err)
});
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