From a6e165ec11d827fe22550c9af868b29e67b9e5b7 Mon Sep 17 00:00:00 2001
From: Alex Ford <aford@forumone.com>
Date: Mon, 1 Jun 2015 11:53:49 -0400
Subject: [PATCH] Add _.mapObject

---
 underscore/underscore-tests.ts |  4 ++++
 underscore/underscore.d.ts     | 25 +++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/underscore/underscore-tests.ts b/underscore/underscore-tests.ts
index 60c1708d0..d530a4334 100644
--- a/underscore/underscore-tests.ts
+++ b/underscore/underscore-tests.ts
@@ -182,6 +182,10 @@ _.omit({ name: 'moe', age: 50, userid: 'moe1' }, 'name');
 _.omit({ name: 'moe', age: 50, userid: 'moe1' }, 'name', 'age');
 _.omit({ name: 'moe', age: 50, userid: 'moe1' }, ['name', 'age']);
 
+_.mapObject({ a: 1, b: 2 }, val => val * 2) === _.mapObject({ a: 2, b: 4 }, _.identity);
+_.mapObject({ a: 1, b: 2 }, (val, key, o) => o[key] * 2) === _.mapObject({ a: 2, b: 4}, _.identity);
+_.mapObject({ x: "string 1", y: "string 2" }, 'length') === _.mapObject({ x: "string 1", y: "string 2"}, _.property('length'));
+
 var iceCream = { flavor: "chocolate" };
 _.defaults(iceCream, { flavor: "vanilla", sprinkles: "lots" });
 
diff --git a/underscore/underscore.d.ts b/underscore/underscore.d.ts
index 03088bffd..653d3ea07 100644
--- a/underscore/underscore.d.ts
+++ b/underscore/underscore.d.ts
@@ -1170,6 +1170,31 @@ interface UnderscoreStatic {
 	* @return List of all the values on `object`.
 	**/
 	values(object: any): any[];
+    
+    /**
+     * Like map, but for objects. Transform the value of each property in turn.
+     * @param object The object to transform
+     * @param iteratee The function that transforms property values
+     * @param context The optional context (value of `this`) to bind to
+     * @return a new _.Dictionary of property values
+     */
+    mapObject<T, U>(object: _.Dictionary<T>, iteratee: (val: T, key: string, object: _.Dictionary<T>) => U, context?: any): _.Dictionary<U>;
+    
+    /**
+     * Like map, but for objects. Transform the value of each property in turn.
+     * @param object The object to transform
+     * @param iteratee The function that tranforms property values
+     * @param context The optional context (value of `this`) to bind to
+     */
+    mapObject<T>(object: any, iteratee: (val: any, key: string, object: any) => T, context?: any): _.Dictionary<T>;
+    
+    /**
+     * Like map, but for objects. Retrieves a property from each entry in the object, as if by _.property
+     * @param object The object to transform
+     * @param iteratee The property name to retrieve
+     * @param context The optional context (value of `this`) to bind to
+     */
+    mapObject(object: any, iteratee: string, context?: any): _.Dictionary<any>;
 
 	/**
 	* Convert an object into a list of [key, value] pairs.