williaster commented on a change in pull request #4791: apply new Dashboard 
builder to dashboard
URL: 
https://github.com/apache/incubator-superset/pull/4791#discussion_r180881658
 
 

 ##########
 File path: superset/assets/javascripts/dashboard/reducers/dashboard.js
 ##########
 @@ -0,0 +1,123 @@
+import d3 from 'd3';
+
+import * as actions from '../actions/dashboard';
+import { alterInArr, addToArr, removeFromArr } from '../../reduxUtils';
+
+export default function dashboard(state = {}, action) {
+  const actionHandlers = {
+    [actions.UPDATE_DASHBOARD_TITLE]() {
+      const newDashboard = { ...state.dashboard, dashboard_title: action.title 
};
+      return { ...state, dashboard: newDashboard };
+    },
+    [actions.ADD_SLICE]() {
+      const updatedSliceIds = new Set(state.dashboard.sliceIds);
+      updatedSliceIds.add(action.slice.slice_id);
+      return {
+        ...state,
+        dashboard: { ...state.dashboard, sliceIds: updatedSliceIds }
+      };
+    },
+    // [actions.UPDATE_DASHBOARD_LAYOUT]() {
+    //   const newDashboard = { ...state.dashboard, layout: action.layout };
+    //   return { ...state, dashboard: newDashboard };
+    // },
+    [actions.REMOVE_SLICE]() {
+      const sliceId = action.sliceId;
+      const updatedSliceIds = new Set(state.dashboard.sliceIds);
+      updatedSliceIds.delete(sliceId);
+
+      const key = String(sliceId);
 
 Review comment:
   why do you need to convert this to a string? all object keys are strings

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