From f0990e288ac73d593e982995947567aa2643b828 Mon Sep 17 00:00:00 2001
From: Jean-Philippe Lachance <jplachance@coveo.com>
Date: Fri, 5 Aug 2016 12:40:35 -0400
Subject: [PATCH 1/2] + Add mapObject in the _ChainOfArrays interface since it
 works fine on runtime

---
 underscore/underscore-tests.ts | 11 +++++++++++
 underscore/underscore.d.ts     |  1 +
 2 files changed, 12 insertions(+)

diff --git a/underscore/underscore-tests.ts b/underscore/underscore-tests.ts
index 26718207d8..951c41bf9f 100644
--- a/underscore/underscore-tests.ts
+++ b/underscore/underscore-tests.ts
@@ -505,6 +505,17 @@ function chain_tests() {
 	var firstVal: number = _.chain([1, 2, 3])
 		.first()
 		.value();
+
+    interface NumberObject {
+        property: string;
+        value: number;
+    }
+    let numberObjects: NumberObject[] = [{property: 'odd', value: 1}, {property: 'even', value: 2}, {property: 'even', value: 0}];
+    let evenNumbers: NumberObject[][] = _.chain(numberObjects)
+        .groupBy('property')
+        .mapObject((objects: any) => _.sortBy(objects, (object: NumberObject) => object.value))
+        .values()
+        .value();
 }
 
 var obj: { [k: string] : number } = {
diff --git a/underscore/underscore.d.ts b/underscore/underscore.d.ts
index 708d7a34d6..cb5dfaa393 100644
--- a/underscore/underscore.d.ts
+++ b/underscore/underscore.d.ts
@@ -5924,6 +5924,7 @@ interface _ChainSingle<T> {
 }
 interface _ChainOfArrays<T> extends _Chain<T[]> {
 	flatten(shallow?: boolean): _Chain<T>;
+	mapObject(fn: _.ListIterator<T, any>): _ChainOfArrays<T>;
 }
 
 declare var _: UnderscoreStatic;

From a6b3f7257a56d0f708ef8d76218c0c9da2ffe37f Mon Sep 17 00:00:00 2001
From: Jean-Philippe Lachance <jplachance@coveo.com>
Date: Fri, 5 Aug 2016 13:47:59 -0400
Subject: [PATCH 2/2] * Simplify with a more explicit example

---
 underscore/underscore-tests.ts | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/underscore/underscore-tests.ts b/underscore/underscore-tests.ts
index 951c41bf9f..fd335b7361 100644
--- a/underscore/underscore-tests.ts
+++ b/underscore/underscore-tests.ts
@@ -506,16 +506,11 @@ function chain_tests() {
 		.first()
 		.value();
 
-    interface NumberObject {
-        property: string;
-        value: number;
-    }
-    let numberObjects: NumberObject[] = [{property: 'odd', value: 1}, {property: 'even', value: 2}, {property: 'even', value: 0}];
-    let evenNumbers: NumberObject[][] = _.chain(numberObjects)
+    let numberObjects = [{property: 'odd', value: 1}, {property: 'even', value: 2}, {property: 'even', value: 0}];
+    let evenAndOddGroupedNumbers = _.chain(numberObjects)
         .groupBy('property')
-        .mapObject((objects: any) => _.sortBy(objects, (object: NumberObject) => object.value))
-        .values()
-        .value();
+        .mapObject((objects: any) => _.pluck(objects, 'value'))
+        .value(); // { odd: [1], even: [0, 2] }
 }
 
 var obj: { [k: string] : number } = {