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Functional Reactive Programming

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“Everything flows, nothing stands still.” Heraclitus

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Streams of Events

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Streams of Events • Fire and forget events are relatively easy to create.

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Streams of Events • Fire and forget events are relatively easy to create. • UIs

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Streams of Events • Fire and forget events are relatively easy to create. • UIs • Ajax posts

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Streams of Events • Fire and forget events are relatively easy to create. • UIs • Ajax posts • Messaging queues

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Processing Events

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Processing Events • A little trickier

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Processing Events • A little trickier • difficult to compose

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Processing Events • A little trickier • difficult to compose • lots of plumbing

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Processing Events • A little trickier • difficult to compose • lots of plumbing • Callback Hell

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“We’re going to need a bigger boat.”

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FRP • A model for values that vary over time • Originates from Haskell Community • Several different implementation styles • We are focusing on Microsoft’s ReactiveExtenions style

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Observable

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Observable • A marriage of Iterables and the Observer Pattern

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Observable • A marriage of Iterables and the Observer Pattern • Typical Sequence functions - Map, Filter, Reduce, Take

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Observable • A marriage of Iterables and the Observer Pattern • Typical Sequence functions - Map, Filter, Reduce, Take • Subscribe/OnNext

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Observable • A marriage of Iterables and the Observer Pattern • Typical Sequence functions - Map, Filter, Reduce, Take • Subscribe/OnNext • Error Handling

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Observable • A marriage of Iterables and the Observer Pattern • Typical Sequence functions - Map, Filter, Reduce, Take • Subscribe/OnNext • Error Handling • Timing function - Delay

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Observable • A marriage of Iterables and the Observer Pattern • Typical Sequence functions - Map, Filter, Reduce, Take • Subscribe/OnNext • Error Handling • Timing function - Delay • Buffering - Last N events

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Observable • A marriage of Iterables and the Observer Pattern • Typical Sequence functions - Map, Filter, Reduce, Take • Subscribe/OnNext • Error Handling • Timing function - Delay • Buffering - Last N events • Composable - SelectMany/FlatMap

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Marble Diagrams

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A Marble Diagrams

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A Marble Diagrams

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A B Marble Diagrams

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A B Marble Diagrams

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A B A.merge(B Marble Diagrams

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A B A.merge(B Marble Diagrams

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A B A.merge(B Marble Diagrams

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A B A.merge(B Marble Diagrams

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A B A.merge(B Marble Diagrams

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A B A.merge(B Marble Diagrams

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A B A.merge(B Marble Diagrams

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A B A.merge(B Marble Diagrams

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A B A.merge(B Marble Diagrams

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A B A.merge(B Marble Diagrams

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A B A.merge(B Marble Diagrams

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Autocomplete • On Keyup • Get the value of the field • Only values of length 3 or more • Make remote call • Filter out bad response • Display results

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Autocomplete in reality • On Keyup • Get the value of the field • Throttle to 500ms • Only values of length 3 or more • Skip duplicates • Make remote call • Filter out bad response • Display results

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Demo Source code: https://github.com/Cicayda/yolk-examples