mapValues util and unit test

Author: frankychung

src/utils/mapValues.js

@@ -0,0 +1,6 @@
+export default function mapValues(obj, fn) {
+  return Object.keys(obj).reduce((result, key) => {
+    result[key] = fn(obj[key], key);
+    return result;
+  }, {});
+}

test/utils/mapValues.spec.js

@@ -0,0 +1,12 @@
+import expect from 'expect';
+import mapValues from '../../src/utils/mapValues';
+
+describe('Utils', () => {
+  describe('mapValues', () => {
+    it('should return object with mapped values', () => {
+      const test = { 'a': 1, 'b': 2 };
+      expect(mapValues(test, val => val * 3)).toEqual({ 'a': 3, 'b': 6 });
+    });
+  });
+});
+