E049 - RxJS Operators Episode 3: Filtering Operators
In part 3 of our series on RxJS operators, the Angular Show panelists Aaron Frost, Jennifer Wadella, and Brian Love, along with our friend Lara Newsom, take a stroll through the filtering operators. The filtering operators enable developers to filter next notifications from an Observable.
The most logical filtering operator to start with is, well, you guessed it, the filter() operator. From there, we look to the operators that only emit a single next notification: first(), last(), find(), and single(). Most of these operators are fairly straight-forward, and often have an optional predicate that can be provided to determine when the operator returns a new Observable that immediately emits the next notification to the Observer, or to the next operator in the pipe. Moving onward Lara teaches us about the family of take() and skip() operators. We didn't list them out here since we are lazy and don't want to type them all out, plus, you should really just have a listen to the show and subscribe! Ok, phew, now Lara and the panelists talk about the ignoreElement() operator, which like the window() operator, has nothing to do with the DOM. Rounding the final bend in our run through the filtering operators we talk about the family of distinct() operators. And, with a sprint to the finish line, we learn about the audit(), debounce() and simple() operators for rate limiting. Speaking of rate-limiting, this is getting long. But, thankfully, this show on the filtering operators is not that long, plus, you can always expect a good time hanging out with the Angular Show. Enjoy!
Connect with us:
Lara Newsom - @LaraNerdsom
Brian Love - @brian_love
Jennifer Wadella - @likeOMGitsFEDAY
Aaron Frost - @aaronfrost