Merge pull request #51 from jorgeavilacardenosa/memoize-reset-cache

memoize reset cache

docs/functions/memoize.md

@@ -7,7 +7,7 @@ Returns the result of function evaluation for a set of parameters, and then on f
 
 <dl>
   <dt>fn</dt>
-  <dd>Function to be executed.</dd>
+  <dd>Function to be executed. Pass null to reset cache</dd>
 
   <dt>args</dt>
   <dd>Arguments to be passed to the called function.</dd>

src/memoize.php

@@ -2,19 +2,29 @@
 
 namespace Akamon\Phunctional;
 
+use Closure;
+
 /**
  * @since 0.1
  *
- * @param callable $fn   function to be executed
- * @param array    $args arguments to be passed to the called function
+ * @param callable|null $fn   function to be executed. Pass null to reset cache
+ * @param array         $args arguments to be passed to the called function
  *
  * @return mixed
  */
-function memoize(callable $fn, ...$args)
+function memoize(callable $fn = null, ...$args)
 {
     static $cache = [];
 
-    $key = md5(spl_object_hash($fn) . serialize($args));
+    if (null === $fn) {
+        $cache = [];
+
+        return null;
+    }
+
+    $closureClass = Closure::class;
+    $keyFn        = $fn instanceof $closureClass ? spl_object_hash($fn) : get_class($fn);
+    $key          = md5($keyFn . serialize($args));
 
     return $cache[$key] = array_key_exists($key, $cache) ? $cache[$key] : $fn(...$args);
 }

tests/MemoizeTest.php

@@ -16,6 +16,16 @@ public function it_should_call_return_the_value_of_the_called_function_caching_t
         $this->assertSame($previousValue, memoize($this->functionWithRandReturn(), 1, 1000000));
     }
 
+    /** @test */
+    public function it_should_reset_the_cache_if_function_to_be_executed_is_null()
+    {
+        $previousValue = memoize($this->functionWithRandReturn(), 1, 1000000);
+
+        memoize();
+
+        $this->assertNotSame($previousValue, memoize($this->functionWithRandReturn(), 1, 1000000));
+    }
+
     /**
      * @test
      * @dataProvider fibonacciValues