Eliminated extra array copy

mapbox · Dec 26, 2019 · a5942cb · a5942cb
1 parent 1ac4425
commit a5942cb
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/MapboxCoreNavigation/RouteLeg.swift b/MapboxCoreNavigation/RouteLeg.swift
@@ -3,6 +3,8 @@ import Turf
 
 extension RouteLeg {
     var shape: LineString {
-        return LineString((steps.first?.shape?.coordinates ?? []) + steps.dropFirst().flatMap { ($0.shape?.coordinates ?? []).dropFirst() })
+        return steps.dropFirst().reduce(into: steps.first?.shape ?? LineString([])) { (result, step) in
+            result.coordinates += (step.shape?.coordinates ?? []).dropFirst()
+        }
     }
 }