ReactiveX (Reactive Extensions): a library for composing asynchronous and event-based programs by using observable sequences See also: 2 minutes introduction to Rx https://medium.com/@andrestaltz/2-minute-introduction-to-rx-24c8ca793877#.rwup8ee0s
Observables and Subscribers. An Observable emits items; a Subscriber consumes those items. The smallest building block is actually an Observer, but in practice you are most often using Subscriber because that's how you hook up to Observables.
Future or single value into an Observable repeat( ) — create an Observable that emits a particular item or sequence of items repeatedly timer( ) — create an Observable that emits a single item after a given delay empty( ) — create an Observable that emits nothing and then completes error( ) — create an Observable that emits nothing and then signals an error never( ) — create an Observable that emits nothing at all
Observable - takeLast( ) — only emit the last n items emitted by an Observable - takeLastBuffer( ) — emit the last n items emitted by an Observable, as a single list item - skip( ) — ignore the first n items emitted by an Observable - take( ) — emit only the first n items emitted by an Observable - first( ) — emit only the first item emitted by an Observable, or the first item that meets some condition - elementAt( ) — emit item n emitted by the source Observable - timeout( ) — emit items from a source Observable, but issue an exception if no item is emitted in a specified timespan - distinct( ) — suppress duplicate items emitted by the source Observable
an Observable by applying a function to each of them - flatMap( ) — transform the items emitted by an Observable into Observables, then flatten this into a single Observable - scan( ) — apply a function to each item emitted by an Observable, sequentially, and emit each successive value - groupBy( ) and groupByUntil( ) — divide an Observable into a set of Observables that emit groups of items from the original Observable, organized by key - buffer( ) — periodically gather items from an Observable into bundles and emit these bundles rather than emitting the items one at a time - window( ) — periodically subdivide items from an Observable into Observable windows and emit these windows rather than emitting the items one at a time