refactored

Sources/XcodeGenKit/ProjectExtensions.swift

@@ -0,0 +1,21 @@
+//
+//  ProjectExtensions.swift
+//  XcodeGen
+//
+//  Created by Yonas Kolb on 19/7/17.
+//
+//
+
+import Foundation
+import xcodeproj
+
+extension Array where Element: ProjectElement {
+
+    var referenceList: [String] {
+        return map { $0.reference }
+    }
+
+    var referenceSet: Set<String> {
+        return Set(referenceList)
+    }
+}