Playing with Projections - Haskell version

Read all about it here first:

playingwithprojections.github.io

Running it

This should do it:

stack run path/to/basic.json

or

stack repl
> cmd ["path/to/basic.json"]

Tips

This is how you get values from events:

event |> event_id              -- String
event |> event_type            -- String
event |> timestamp             -- ZonedTime
event |> payload |> quiz_title -- String

Note: x |> f = f x, it's from the Flow library.

Video

There's a video by @mathiasverraes and @ericevans0 that explains some stuff, albeit rather chaotic.

Domain