Filter Redundant Observable Emissions with RxJS distinct
Operator distinct() and its variants are an important type of Filtering operator. This lessons shows how they work and in what cases are they useful.
🚨 Since we are importing interval from RxJS, we don't need to preface our Observables with Rx.Observable. You can no longer .{operator}, you need to .pipe({operator}) instead.
Jon
~ 8 years ago
For people using TypeScript, you have have to import 'rxjs/add/operator/distinct'; Distinct was not included when importing 'rxjs/Rx'; and my build was erroring out.
Mike
~ 7 years ago
var result = foo.distinct((x,y) => x.toLowerCase() === y.toLowerCase());gives: "error: TypeError: y is undefined"
Should be:
var result = foo.distinct((x) => x.toLowerCase());André Staltzinstructor
~ 7 years ago
Hi Mike. That's correct. We should update the lesson to use a 'keySelector' function, not a 'compare' function.