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Fix bug in freemonad doc #878

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merged 2 commits into from
Feb 21, 2016
Merged

Fix bug in freemonad doc #878

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b33be92
Fix bug in freemonad doc
ceedubs Feb 13, 2016
ee36b14
Add explicit return type to impure compiler in freemonad docs
ceedubs Feb 13, 2016
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11 changes: 6 additions & 5 deletions docs/src/main/tut/freemonad.md
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Original file line number Diff line number Diff line change
Expand Up @@ -171,13 +171,14 @@ value store:
import cats.{Id, ~>}
import scala.collection.mutable

// a very simple (and imprecise) key-value store
val kvs = mutable.Map.empty[String, Any]

// the program will crash if a key is not found,
// or if a type is incorrectly specified.
def impureCompiler =
def impureCompiler: KVStoreA ~> Id =
new (KVStoreA ~> Id) {

// a very simple (and imprecise) key-value store
val kvs = mutable.Map.empty[String, Any]

def apply[A](fa: KVStoreA[A]): Id[A] =
fa match {
case Put(key, value) =>
Expand Down Expand Up @@ -274,7 +275,7 @@ val pureCompiler: KVStoreA ~> KVStoreState = new (KVStoreA ~> KVStoreState) {
fa match {
case Put(key, value) => State.modify(_.updated(key, value))
case Get(key) =>
State.pure(kvs.get(key).map(_.asInstanceOf[A]))
State.inspect(_.get(key).map(_.asInstanceOf[A]))
case Delete(key) => State.modify(_ - key)
}
}
Expand Down