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first order observable

plain observable

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higher order observable

observable returned from within an observable

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switch

unsubscribes from previous and keep current

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mergeall

• mergeAll([n]) -> does not unsubscribe previous, it keeps all and merge results up to n subscriptions, later will not be created
• it remembers observables and throws them when space available in the subscriptions array
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concatall

• buffers all observables and sends each one in order after the previous is finished
• concatAll = mergeAll(1)

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switchmap

• switchMap = map().switch()
• returns another first order observable
• useful for calls to API on click/route change...
• internally knows how to convert promises to observables

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mergemap

• also flatMap
• returns another first order observable
• does not cancel previous subscription
• mergeMap(fn, (outer, inner) => ,concurrentSubscriptions)
• outer: event from first order obs, inner, current observable
• further subscriptions will take place when older unsubscribe

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concatmap

• mergeMap(1)

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window

• separates observable1 into new streams based on observable2
• like .split('.')
• mapping results can give you number of seconds between 2 clicks, for instance

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window

• windowCount(n)
• windowTime(timeSpan, timeCreationInterval)
• windowToggle(openWindowObs, closeWindowObs)

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groupBy

• separates a stream into n streams depending on the value returned by the condition (true/false; 1, 2, 3; R,G,B ...)
• like in keyEvent, mouseEvent, midiEvent

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