Add memoizeCapped.

lodash.js

@@ -6220,6 +6220,26 @@
       };
     }
 
+    /**
+     * A specialized version of `_.memoize` which clears the memoized function's
+     * cache when it exceeds `MAX_MEMOIZE_SIZE`.
+     *
+     * @private
+     * @param {Function} func The function to have its output memoized.
+     * @returns {Function} Returns the new memoized function.
+     */
+    function memoizeCapped(func) {
+      var result = memoize(func, function(key) {
+        if (cache.size === MAX_MEMOIZE_SIZE) {
+          cache.clear();
+        }
+        return key;
+      });
+
+      var cache = result.cache;
+      return result;
+    }
+
     /**
      * Merges the function metadata of `source` into `data`.
      *
@@ -6486,7 +6506,7 @@
      * @param {string} string The string to convert.
      * @returns {Array} Returns the property path array.
      */
-    var stringToPath = memoize(function(string) {
+    var stringToPath = memoizeCapped(function(string) {
       string = toString(string);
 
       var result = [];
@@ -10341,9 +10361,6 @@
           return cache.get(key);
         }
         var result = func.apply(this, args);
-        if (cache.size === MAX_MEMOIZE_SIZE) {
-          cache = cache.clear() || cache;
-        }
         memoized.cache = cache.set(key, result) || cache;
         return result;
       };