I'm faced with a challenge involving a function that validates items using the following definition:
validate(item: ValidationItem): Observable<ValidationResult>{}
My task now is to develop a function that can iterate through an array of ValidationItems, validate each one, and once all have been validated, execute additional logic before returning a final result. How should I approach implementing this functionality?
Check out the forkJoin method in action
Using
forkJoinallows you to wait for multiple Observables to complete and then emit the last value from each
function validate(item: ValidationItem): Observable<ValidationResult>
const items: ValidationItem[] = [];
const validationResults$ = items.map(item => validate(item));
forkJoin(validationResults$).pipe(
/* "perform some operations and return a final result" */
)
If you're in need of the forkJoin operator, look no further. This operator returns an observable that emits a single time, specifically when all participating observables have completed:
const x = of(1, 2, 3);
const y = of(10, 20, 30);
const z = of(100, 200, 300);
const items = [x, y, z];
/* produces [3, 30, 300] */
forkJoin([x, y, z]).subscribe(results => console.log(results));
You can experiment with this code snippet online via Stackblitz.
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