From 9bd0c01702ea8619f030f3490f86b45ab9abc94d Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Fri, 10 May 2013 23:20:10 -0700
Subject: [PATCH] Expose memoized function's `cache`. [closes #265]

Former-commit-id: fc44676386854ec9d5fd7a4fac8583508d63949f
---
 build/pre-compile.js |  1 +
 lodash.js            | 11 +++++++----
 test/test.js         | 16 ++++++++++++++++
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/build/pre-compile.js b/build/pre-compile.js
index 107b281b3..ffe53a78e 100644
--- a/build/pre-compile.js
+++ b/build/pre-compile.js
@@ -93,6 +93,7 @@
     'bind',
     'bindAll',
     'bindKey',
+    'cache',
     'clearTimeout',
     'clone',
     'cloneDeep',
diff --git a/lodash.js b/lodash.js
index 42973fce7..ad117f5c5 100644
--- a/lodash.js
+++ b/lodash.js
@@ -4615,13 +4615,16 @@
      * });
      */
     function memoize(func, resolver) {
-      var cache = {};
-      return function() {
-        var key = keyPrefix + (resolver ? resolver.apply(this, arguments) : arguments[0]);
+      function memoized() {
+        var cache = memoized.cache,
+            key = keyPrefix + (resolver ? resolver.apply(this, arguments) : arguments[0]);
+
         return hasOwnProperty.call(cache, key)
           ? cache[key]
           : (cache[key] = func.apply(this, arguments));
-      };
+      }
+      memoized.cache = {};
+      return memoized;
     }
 
     /**
diff --git a/test/test.js b/test/test.js
index 7155a425d..3f4518106 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1900,6 +1900,22 @@
 
   /*--------------------------------------------------------------------------*/
 
+  QUnit.module('lodash.memoize');
+
+  (function() {
+    test('should expose a `cache` object on the `memoized` function', function() {
+      var memoized = _.memoize(_.identity);
+      memoized('x');
+
+      var cache = memoized.cache,
+          key = _.keys(cache)[0];
+
+      equal(cache[key], 'x');
+    });
+  }());
+
+  /*--------------------------------------------------------------------------*/
+
   QUnit.module('lodash.merge');
 
   (function() {