diff --git a/lodash/lodash-tests.ts b/lodash/lodash-tests.ts
index d58368b794..cc4ab44085 100644
--- a/lodash/lodash-tests.ts
+++ b/lodash/lodash-tests.ts
@@ -425,9 +425,17 @@ result = <_.Dictionary<number[]>>_.groupBy([4.2, 6.1, 6.4], function (num) { ret
 result = <_.Dictionary<number[]>>_.groupBy([4.2, 6.1, 6.4], function (num) { return this.floor(num); }, Math);
 result = <_.Dictionary<string[]>>_.groupBy(['one', 'two', 'three'], 'length');
 
-result = <_.LoDashObjectWrapper<_.Dictionary<number[]>>>_([4.2, 6.1, 6.4]).groupBy(function (num) { return Math.floor(num); });
-result = <_.LoDashObjectWrapper<_.Dictionary<number[]>>>_([4.2, 6.1, 6.4]).groupBy(function (num) { return this.floor(num); }, Math);
-result = <_.LoDashObjectWrapper<_.Dictionary<string[]>>>_(['one', 'two', 'three']).groupBy('length');
+result = <_.Dictionary<number[]>>_.groupBy({ prop1: 4.2, prop2: 6.1, prop3: 6.4}, function (num) { return Math.floor(num); });
+result = <_.Dictionary<number[]>>_.groupBy({ prop1: 4.2, prop2: 6.1, prop3: 6.4}, function (num) { return this.floor(num); }, Math);
+result = <_.Dictionary<string[]>>_.groupBy({ prop1: 'one', prop2: 'two', prop3: 'three'}, 'length');
+
+result = <_.Dictionary<number[]>>_([4.2, 6.1, 6.4]).groupBy(function (num) { return Math.floor(num); }).value();
+result = <_.Dictionary<number[]>>_([4.2, 6.1, 6.4]).groupBy(function (num) { return this.floor(num); }, Math).value();
+result = <_.Dictionary<string[]>>_(['one', 'two', 'three']).groupBy('length').value();
+
+result = <_.Dictionary<number[]>>_({ prop1: 4.2, prop2: 6.1, prop3: 6.4}).groupBy<number>(function (num) { return Math.floor(num); }).value();
+result = <_.Dictionary<number[]>>_({ prop1: 4.2, prop2: 6.1, prop3: 6.4}).groupBy<number>(function (num) { return this.floor(num); }, Math).value();
+result = <_.Dictionary<string[]>>_({ prop1: 'one', prop2: 'two', prop3: 'three'}).groupBy<string>('length').value();
 
 result = <_.Dictionary<IKey>>_.indexBy(keys, 'dir');
 result = <_.Dictionary<IKey>>_.indexBy(keys, function (key) { return String.fromCharCode(key.code); });
@@ -556,7 +564,11 @@ result = <number[]>_([1, 2, 3]).sortBy(function (num) { return Math.sin(num); })
 result = <number[]>_([1, 2, 3]).sortBy(function (num) { return this.sin(num); }, Math).value();
 result = <string[]>_(['banana', 'strawberry', 'apple']).sortBy('length').value();
 
-(function (a: number, b: number, c: number, d: number) { return _.toArray(arguments).slice(1); })(1, 2, 3, 4);
+(function (a: number, b: number, c: number, d: number): Array<number> { return _.toArray(arguments).slice(1); })(1, 2, 3, 4);
+result = <number[]>_.toArray([1, 2, 3, 4]);
+(function (a: number, b: number, c: number, d: number): Array<number> { return _(arguments).toArray<number>().slice(1).value(); })(1, 2, 3, 4);
+result = <number[]>_([1,2,3,4]).toArray().value();
+
 
 result = <IStoogesCombined[]>_.where(stoogesCombined, { 'age': 40 });
 result = <IStoogesCombined[]>_.where(stoogesCombined, { 'quotes': ['Poifect!'] });
diff --git a/lodash/lodash.d.ts b/lodash/lodash.d.ts
index e51a598252..24e55836ae 100644
--- a/lodash/lodash.d.ts
+++ b/lodash/lodash.d.ts
@@ -3169,6 +3169,30 @@ declare module _ {
         groupBy<W, T>(
             collection: List<T>,
             whereValue: W): Dictionary<T[]>;
+
+        /**
+        * @see _.groupBy
+        **/
+        groupBy<T>(
+            collection: Dictionary<T>,
+            callback?: ListIterator<T, any>,
+            thisArg?: any): Dictionary<T[]>;
+
+        /**
+        * @see _.groupBy
+        * @param pluckValue _.pluck style callback
+        **/
+        groupBy<TValue>(
+            collection: Dictionary<TValue>,
+            pluckValue: string): Dictionary<TValue[]>;
+
+        /**
+        * @see _.groupBy
+        * @param whereValue _.where style callback
+        **/
+        groupBy<W, TValue>(
+            collection: Dictionary<TValue>,
+            whereValue: W): Dictionary<TValue[]>;
     }
 
     interface LoDashArrayWrapper<T> {
@@ -3177,19 +3201,40 @@ declare module _ {
         **/
         groupBy(
             callback: ListIterator<T, any>,
-            thisArg?: any): _.LoDashObjectWrapper<Dictionary<T[]>>;
+            thisArg?: any): _.LoDashObjectWrapper<_.Dictionary<T[]>>;
 
         /**
         * @see _.groupBy
         **/
         groupBy(
-            pluckValue: string): _.LoDashObjectWrapper<Dictionary<T[]>>;
+            pluckValue: string): _.LoDashObjectWrapper<_.Dictionary<T[]>>;
 
         /**
         * @see _.groupBy
         **/
         groupBy<W>(
-            whereValue: W): _.LoDashObjectWrapper<Dictionary<T[]>>;
+            whereValue: W): _.LoDashObjectWrapper<_.Dictionary<T[]>>;
+    }
+
+    interface LoDashObjectWrapper<T> {
+        /**
+        * @see _.groupBy
+        **/
+        groupBy<TValue>(
+            callback: ListIterator<TValue, any>,
+            thisArg?: any): _.LoDashObjectWrapper<_.Dictionary<TValue[]>>;
+
+        /**
+        * @see _.groupBy
+        **/
+        groupBy<TValue>(
+            pluckValue: string): _.LoDashObjectWrapper<_.Dictionary<TValue[]>>;
+
+        /**
+        * @see _.groupBy
+        **/
+        groupBy<W, TValue>(
+            whereValue: W): _.LoDashObjectWrapper<_.Dictionary<TValue[]>>;
     }
 
     //_.indexBy
@@ -4520,6 +4565,20 @@ declare module _ {
         toArray<T>(collection: Dictionary<T>): T[];
     }
 
+    interface LoDashArrayWrapper<T> {
+        /**
+        * @see _.toArray
+        **/
+        toArray(): LoDashArrayWrapper<T>;
+    }
+
+    interface LoDashObjectWrapper<T> {
+        /**
+        * @see _.toArray
+        **/
+        toArray<TValue>(): LoDashArrayWrapper<TValue>;
+    }
+
     //_.where
     interface LoDashStatic {
         /**