CODEWITHSUNDEEP
reactive-programmingrxjs
Tom Larkworthy
Tom Larkworthy

Reputation: 2364

Assert two streams are the same

I am trying to build a test case that checks if two streams are the same. Zip can be used to check the value elements are the same, but it doesn't help if one stream is the wrong length. Any ideas on how to approach this?

Upvotes: 1

Views: 556

Answers (1)

Noah Freitas
Noah Freitas

Reputation: 17430

There's an operator for that: sequenceEqual.

Returns

(Observable): An observable sequence that contains a single element which indicates whether both sequences are of equal length and their corresponding elements are equal according to the specified equality comparer.

Here's a simple example showing the length equality check.

var log = console.log.bind(console);

Rx.Observable.of(1, 2, 3)
             .sequenceEqual(Rx.Observable.of(1, 2, 3))
             .subscribe(log); // logs true

Rx.Observable.of(1, 2, 3)
             .sequenceEqual(Rx.Observable.of(1, 2))
             .subscribe(log); // logs false

Upvotes: 3

Related Questions