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I implemented a dataflow language a few years ago, for data binding scenarios in a web application.

In a record-oriented data entry and validation heavy application domain, finance sector, insurance policy records, that kind of thing, an imperative approach to updating the user view gets messy pretty quickly. Using a dataflow approach, the client could receive minimal incremental updates from the server in response to events the client sent to the server, such as filling in a field or selecting a value from a drop-down. Because the structure of the UI was declarative, forms could be both pre-populated on download and incrementally updated (with AJAX) using the same set of definitions, rather than ad-hoc cooperation between either end.

Dataflow is trivially parallelizable in so far as it's not difficult to find things to parallelize; selecting an appropriately sized unit of work is somewhat trickier though.

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