diff --git a/build/pre-compile.js b/build/pre-compile.js
index 21fc8e6d5..ee992cc35 100644
--- a/build/pre-compile.js
+++ b/build/pre-compile.js
@@ -14,6 +14,7 @@
   /** Used to minify variables embedded in compiled strings */
   var compiledVars = [
     'accumulator',
+    'args',
     'array',
     'arrayClass',
     'bind',
@@ -37,6 +38,7 @@
     'length',
     'object',
     'Math',
+    'methodName',
     'prop',
     'property',
     'result',
diff --git a/lodash.js b/lodash.js
index c771d70e5..ab502734e 100644
--- a/lodash.js
+++ b/lodash.js
@@ -481,8 +481,10 @@
    * // => { '3': ['one', 'two'], '5': ['three'] }
    */
   var groupBy = iterationFactory(forEachFactoryOptions, {
-    'top': 'var prop,isFunc=toString.call(callback)==funcClass',
     'init': '{}',
+    'beforeLoop':
+      'var prop,isFunc=toString.call(callback)==funcClass;\n' +
+      'if(isFunc&&thisArg)callback=bind(callback,thisArg)',
     'inLoop':
       'prop=isFunc?callback(collection[index],index,collection):collection[index][callback];\n' +
       '(result[prop]||(result[prop]=[])).push(collection[index])'
@@ -504,14 +506,17 @@
    * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort');
    * // => [[1, 5, 7], [1, 2, 3]]
    */
-  function invoke(collection, methodName) {
-    var args = slice.call(arguments, 2),
-        isFunc = isFunction(methodName);
-
-    return map(collection, function(value) {
-      return (isFunc ? methodName || value : value[methodName]).apply(value, args);
-    });
-  }
+  var invoke = iterationFactory(mapFactoryOptions, {
+    'args': 'collection,methodName',
+    'top': 'var args=slice.call(arguments,2),isFunc=toString.call(methodName)==funcClass',
+    'inLoop': (function() {
+      var value = '(isFunc?methodName:collection[index][methodName]).apply(collection[index],args)';
+      return {
+        'array': 'result[index]=' + value,
+        'object': 'result[result.length]=' + value
+      };
+    }())
+  });
 
   /**
    * Produces a new array of values by mapping each value in the `collection`
diff --git a/lodash.min.js b/lodash.min.js
index a1692bddd..581b3f078 100644
--- a/lodash.min.js
+++ b/lodash.min.js
@@ -2,25 +2,25 @@
  Lo-Dash 0.1.0 github.com/bestiejs/lodash/blob/master/LICENSE.txt
  Underscore.js 1.3.3 github.com/documentcloud/underscore/blob/master/LICENSE
 */
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diff --git a/test/test.js b/test/test.js
index 06d0a0b5a..49636cc14 100644
--- a/test/test.js
+++ b/test/test.js
@@ -87,6 +87,20 @@
 
   /*--------------------------------------------------------------------------*/
 
+  QUnit.module('lodash.groupBy');
+
+  (function() {
+    test('supports the `thisArg` argument', function() {
+      var actual = _.groupBy([1.3, 2.1, 2.4], function(num) {
+        return this.floor(num);
+      }, Math);
+
+      deepEqual(actual, { '1': [1.3], '2': [2.1, 2.4] });
+    });
+  }());
+
+  /*--------------------------------------------------------------------------*/
+
   QUnit.module('lodash.initial');
 
   (function() {
@@ -136,6 +150,20 @@
 
   /*--------------------------------------------------------------------------*/
 
+  QUnit.module('lodash.sortBy');
+
+  (function() {
+    test('supports the `thisArg` argument', function() {
+      var actual = _.sortBy([1, 2, 3, 4], function(num) {
+        return this.sin(num);
+      }, Math);
+
+      deepEqual(actual, [4, 3, 1, 2]);
+    });
+  }());
+
+  /*--------------------------------------------------------------------------*/
+
   QUnit.module('lodash.toArray');
 
   (function() {