Event evolutions as fold over evolution functions

FoldEnvolve.scala

val evolutions = List(
  (v: JsObject) => v + ("a" -> JsString("foo")), 
  (v: JsObject) => v + ("b" -> JsNumber(2)),
  (v: JsObject) => v - "a"
  )

//evolutions: List[play.api.libs.json.JsObject => play.api.libs.json.JsObject] = List(<function1>, <function1>)

evolutions.foldLeft(Json.obj("msg" -> "Nice Evolution"))((value, evolution) => evolution(value))

// res1: play.api.libs.json.JsObject = {"msg":"Nice Evolution","b":2}