From d407d8aa08a6f739441a82e3b7c9d8a5cf66ba16 Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Thu, 1 Oct 2015 08:55:49 -0700
Subject: [PATCH] Ensure `_.isFunction` returns `true` for generator functions.
 [closes #1498]

---
 lodash.js    |  7 ++++++-
 test/test.js | 10 ++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/lodash.js b/lodash.js
index 9cab06d21..3abd8b463 100644
--- a/lodash.js
+++ b/lodash.js
@@ -68,6 +68,7 @@
       dateTag = '[object Date]',
       errorTag = '[object Error]',
       funcTag = '[object Function]',
+      genTag = '[object GeneratorFunction]',
       mapTag = '[object Map]',
       numberTag = '[object Number]',
       objectTag = '[object Object]',
@@ -8697,7 +8698,11 @@
       // The use of `Object#toString` avoids issues with the `typeof` operator
       // in Safari 8 which returns 'object' for typed array constructors, and
       // PhantomJS 1.9 which returns 'function' for `NodeList` instances.
-      return isObject(value) && objToString.call(value) == funcTag;
+      if (!isObject(value)) {
+        return false;
+      }
+      var tag = objToString.call(value);
+      return tag == funcTag || tag == genTag;
     }
 
     /**
diff --git a/test/test.js b/test/test.js
index 1a2bd4443..e41238554 100644
--- a/test/test.js
+++ b/test/test.js
@@ -8549,6 +8549,16 @@
       assert.strictEqual(_.isFunction(slice), true);
     });
 
+    QUnit.test('should return `true` for generator functions', function(assert) {
+      assert.expect(1);
+
+      var generator = _.attempt(function() {
+        return Function('return function*(){}');
+      });
+
+      assert.strictEqual(_.isFunction(generator), typeof generator == 'function');
+    });
+
     QUnit.test('should return `true` for typed array constructors', function(assert) {
       assert.expect(1);