Make allItems a var

Author: Simon Whitaker

Multiset/Multiset.playground/Contents.swift

@@ -16,4 +16,5 @@ set.add("Baz")
 set.count
 set.count(for: "Foo")
 
-set.allItems()
+set.allItems
+

Multiset/Multiset.playground/Sources/Multiset.swift

@@ -55,14 +55,16 @@ public struct Multiset<T: Hashable> {
     return self.storage[key] ?? 0
   }
 
-  public func allItems() -> [T] {
-    var result = Array<T>()
-    for (key, count) in self.storage {
-      for _ in 0 ..< count {
-        result.append(key)
+  public var allItems: [T] {
+    get {
+      var result = Array<T>()
+      for (key, count) in self.storage {
+        for _ in 0 ..< count {
+          result.append(key)
+        }
       }
+      return result
     }
-    return result
   }
 }