Hello everyone, I have a question to ask and I hope it's clear enough for you all.
My goal is to send a series of requests one after the other (could be a large number) in order to retrieve data.
The data obtained from each request should be gathered and returned as a single observable once all requests are completed.
I tried using forkJoin to merge the requests, but it doesn't guarantee sequential execution, and also considered concat, which emits an observable after each request.
If you need to:
One approach is to use concat alongside toArray. With this setup, concat will ensure sequential execution of requests, while toArray will aggregate responses into an array.
// dynamic array containing values
const source = [ 1, 2, 3, 4, 5 ];
const observables = source.map(x => this.http.get('some url'));
concat(
...observables
).pipe(
toArray()
).subscribe(responses => {
console.log(responses);
// array of collected results
});
Try it out: https://stackblitz.com/edit/angular-s1fdxj
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