categories.md

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Operators by Categories

This topic lists all major operators implemented by the Observable type by their categories, specifically: creation, conversion, combine, functional, mathematical, time, exceptions, miscellaneous, selection and primitives.

Operators by Categories

Usage	Operators
Creating an observable sequence	create defer generate generateWithAbsoluteTime generateWithRelativeTime range using
Converting events or asynchronous patterns to observable sequences, or between Arrays and observable sequences.	from fromArray fromCallback fromNodeCallback fromEvent fromEventPattern fromPromise of toArray toMap toPromise toSet
Combining multiple observable sequences into a single sequence.	amb prototype.amb combineLatest proto.combineLatest concat prototype.concat startWith merge prototype.merge mergeAll repeat prototype.repeat withLatestFrom zip prototype.zip
Functional - Sharing Side Effects	let publish publishLast publishValue replay share shareLast shareReplay shareValue
Mathemathical operators on sequences	aggregate average count max maxBy min minBy reduce sum
Time-based operations	debounce debounceWithSelector delay interval sample timeInterval timer timeout timeoutWithSelector timestamp
Handling Exceptions	catch prototype.catch finally onErrorResumenext prototype.onErrorResumeNext retry
Filtering and selecting values in a sequence	concatMap concatMapObserver elementAt elementAtOrDefault filter flatMap flatMapLatest flatMapObserver find findIndex first firstOrDefault includes last lastOrDefault map pluck select selectConcat selectMany selectManyObserver selectSwitch single singleOrDefault skip skipLast skipLastWithTime skipUntil skipWhile take takeLast takeLastBuffer takeLastBufferWithTime takeLastWithTime takeWhile where
Grouping and Windowing	buffer bufferWithCount bufferWithTimeOrCount groupBy groupByUntil groupJoin join window windowWithCount windowWithTime windowWithTimeOrCount
Imperative Operators	case do doOnNext doOnError doOnCompleted doWhile for if tap tapOnNext tapOnError tapOnCompleted while
Primitives	empty never return throw

See Also

Reference

• Observable

Concepts

• Querying Observable Sequences