Implementazione di una classe per applicare la tecnica della Memoization

functional-programming-java/src/main/java/org/gym/fp/fpjava/type/Memoizer.java

@@ -0,0 +1,19 @@
+package org.gym.fp.fpjava.type;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public final class Memoizer<T, U> {
+    private final Map<T, U> cache = new ConcurrentHashMap<>();
+
+    private Memoizer() {
+    }
+
+    public static <T, U> Function<T, U> memoize(Function<T, U> function) {
+        return new Memoizer<T, U>().doMemoize(function);
+    }
+
+    private Function<T, U> doMemoize(Function<T, U> function) {
+        return input -> cache.computeIfAbsent(input, function::apply);
+    }
+}