interfaces-to-funs.4 : Introduce destinationFinder

Duncan McGregor · dmcg · commit 001e74379236 · 2021-06-25T09:53:05.000+01:00
diff --git a/src/main/java/travelator/recommendations/Recommendations.kt b/src/main/java/travelator/recommendations/Recommendations.kt
@@ -1,5 +1,6 @@
 package travelator.recommendations
 
+import travelator.destinations.FeaturedDestination
 import travelator.destinations.FeaturedDestinations
 import travelator.domain.DistanceCalculator
 import travelator.domain.Location
@@ -8,6 +9,10 @@ class Recommendations(
     private val featuredDestinations: FeaturedDestinations,
     private val distanceCalculator: DistanceCalculator
 ) {
+    private val destinationFinder: // <1>
+        (Location) -> List<FeaturedDestination> =
+        featuredDestinations::findCloseTo
+
     fun recommendationsFor(
         journey: Set<Location>
     ): List<FeaturedDestinationSuggestion> =
@@ -19,7 +24,7 @@ class Recommendations(
     fun recommendationsFor(
         location: Location
     ): List<FeaturedDestinationSuggestion> =
-        featuredDestinations.findCloseTo(location)
+        destinationFinder(location) // <2>
             .map { featuredDestination ->
                 FeaturedDestinationSuggestion(
                     location,
@@ -32,6 +37,7 @@ class Recommendations(
             }
 }
 
+
 private fun List<FeaturedDestinationSuggestion>.deduplicated() =
     groupBy { it.suggestion }
         .values
