Use reselect to memoize denormalization in UI state

Also upgrade react-redux to latest version. This is a performance update

app/assets/javascripts/components.js

@@ -3,6 +3,7 @@
 
 window.React    = require('react');
 window.ReactDOM = require('react-dom');
+window.Perf     = require('react-addons-perf');
 
 //= require_tree ./components
 

app/assets/javascripts/components/components/status_list.jsx

@@ -28,7 +28,7 @@ const StatusList = React.createClass({
     const { statuses, onScrollToBottom, ...other } = this.props;
 
     return (
-      <div style={{ overflowY: 'scroll', flex: '1 1 auto' }} className='scrollable' onScroll={this.handleScroll}>
+      <div style={{ overflowY: 'scroll', flex: '1 1 auto', overflowX: 'hidden' }} className='scrollable' onScroll={this.handleScroll}>
         <div>
           {statuses.map((status) => {
             return <Status key={status.get('id')} {...other} status={status} />;

app/assets/javascripts/components/features/account/index.jsx

@@ -20,22 +20,18 @@ import {
 }                            from '../../actions/interactions';
 import Header                from './components/header';
 import {
-  selectStatus,
-  selectAccount
-}                            from '../../reducers/timelines';
+  getAccountTimeline,
+  getAccount
+}                            from '../../selectors';
 import StatusList            from '../../components/status_list';
 import LoadingIndicator      from '../../components/loading_indicator';
 import Immutable             from 'immutable';
 import ActionBar             from './components/action_bar';
 import Column                from '../ui/components/column';
 
-function selectStatuses(state, accountId) {
-  return state.getIn(['timelines', 'accounts_timelines', accountId], Immutable.List([])).map(id => selectStatus(state, id)).filterNot(status => status === null);
-};
-
 const mapStateToProps = (state, props) => ({
-  account: selectAccount(state, Number(props.params.accountId)),
-  statuses: selectStatuses(state, Number(props.params.accountId)),
+  account: getAccount(state, Number(props.params.accountId)),
+  statuses: getAccountTimeline(state, Number(props.params.accountId)),
   me: state.getIn(['timelines', 'me'])
 });
 

app/assets/javascripts/components/features/public_timeline/index.jsx

@@ -1,32 +1,34 @@
-import { connect }        from 'react-redux';
-import PureRenderMixin    from 'react-addons-pure-render-mixin';
-import ImmutablePropTypes from 'react-immutable-proptypes';
-import StatusList         from '../../components/status_list';
-import Column             from '../ui/components/column';
-import Immutable          from 'immutable';
-import { selectStatus }   from '../../reducers/timelines';
+import { connect }         from 'react-redux';
+import PureRenderMixin     from 'react-addons-pure-render-mixin';
+import ImmutablePropTypes  from 'react-immutable-proptypes';
+import StatusList          from '../../components/status_list';
+import Column              from '../ui/components/column';
+import Immutable           from 'immutable';
+import { makeGetTimeline } from '../../selectors';
 import {
   updateTimeline,
   refreshTimeline,
   expandTimeline
-}                         from '../../actions/timelines';
-import { deleteStatus }   from '../../actions/statuses';
-import { replyCompose }   from '../../actions/compose';
+}                          from '../../actions/timelines';
+import { deleteStatus }    from '../../actions/statuses';
+import { replyCompose }    from '../../actions/compose';
 import {
   favourite,
   reblog,
   unreblog,
   unfavourite
-}                         from '../../actions/interactions';
+}                          from '../../actions/interactions';
 
-function selectStatuses(state) {
-  return state.getIn(['timelines', 'public'], Immutable.List()).map(id => selectStatus(state, id)).filterNot(status => status === null);
-};
+const makeMapStateToProps = () => {
+  const getTimeline = makeGetTimeline();
 
-const mapStateToProps = (state) => ({
-  statuses: selectStatuses(state),
-  me: state.getIn(['timelines', 'me'])
-});
+  const mapStateToProps = (state) => ({
+    statuses: getTimeline(state, 'public'),
+    me: state.getIn(['timelines', 'me'])
+  });
+
+  return mapStateToProps;
+};
 
 const PublicTimeline = React.createClass({
 
@@ -100,4 +102,4 @@ const PublicTimeline = React.createClass({
 
 });
 
-export default connect(mapStateToProps)(PublicTimeline);
+export default connect(makeMapStateToProps)(PublicTimeline);

app/assets/javascripts/components/features/status/index.jsx

@@ -10,16 +10,16 @@ import ActionBar             from './components/action_bar';
 import Column                from '../ui/components/column';
 import { favourite, reblog } from '../../actions/interactions';
 import { replyCompose }      from '../../actions/compose';
-import { selectStatus }      from '../../reducers/timelines';
-
-function selectStatuses(state, ids) {
-  return ids.map(id => selectStatus(state, id)).filterNot(status => status === null);
-};
+import {
+  getStatus,
+  getStatusAncestors,
+  getStatusDescendants
+}                            from '../../selectors';
 
 const mapStateToProps = (state, props) => ({
-  status: selectStatus(state, Number(props.params.statusId)),
-  ancestors: selectStatuses(state, state.getIn(['timelines', 'ancestors', Number(props.params.statusId)], Immutable.OrderedSet())),
-  descendants: selectStatuses(state, state.getIn(['timelines', 'descendants', Number(props.params.statusId)], Immutable.OrderedSet())),
+  status: getStatus(state, Number(props.params.statusId)),
+  ancestors: getStatusAncestors(state, Number(props.params.statusId)),
+  descendants: getStatusDescendants(state, Number(props.params.statusId)),
   me: state.getIn(['timelines', 'me'])
 });
 

app/assets/javascripts/components/features/ui/containers/compose_form_container.jsx

@@ -1,14 +1,14 @@
 import { connect }                                          from 'react-redux';
 import ComposeForm                                          from '../components/compose_form';
 import { changeCompose, submitCompose, cancelReplyCompose } from '../../../actions/compose';
-import { selectStatus }                                     from '../../../reducers/timelines';
+import { getStatus }                                        from '../../../selectors';
 
 const mapStateToProps = function (state, props) {
   return {
     text: state.getIn(['compose', 'text']),
     is_submitting: state.getIn(['compose', 'is_submitting']),
     is_uploading: state.getIn(['compose', 'is_uploading']),
-    in_reply_to: selectStatus(state, state.getIn(['compose', 'in_reply_to']))
+    in_reply_to: getStatus(state, state.getIn(['compose', 'in_reply_to']))
   };
 };
 

app/assets/javascripts/components/features/ui/containers/notifications_container.jsx

@@ -4,14 +4,10 @@ import {
   dismissNotification,
   clearNotifications
 }                              from '../../../actions/notifications';
+import { getNotifications }    from '../../../selectors';
 
 const mapStateToProps = (state, props) => ({
-  notifications: state.get('notifications').map((item, i) => ({
-    message: item.get('message'),
-    title: item.get('title'),
-    key: item.get('key'),
-    dismissAfter: 5000
-  })).toJS()
+  notifications: getNotifications(state)
 });
 
 const mapDispatchToProps = (dispatch) => {

app/assets/javascripts/components/features/ui/containers/status_list_container.jsx

@@ -8,14 +8,18 @@ import {
   unfavourite
 }                            from '../../../actions/interactions';
 import { expandTimeline }    from '../../../actions/timelines';
-import { selectStatus }      from '../../../reducers/timelines';
+import { makeGetTimeline }   from '../../../selectors';
 import { deleteStatus }      from '../../../actions/statuses';
 
-const mapStateToProps = function (state, props) {
-  return {
-    statuses: state.getIn(['timelines', props.type]).map(id => selectStatus(state, id)),
+const makeMapStateToProps = () => {
+  const getTimeline = makeGetTimeline();
+
+  const mapStateToProps = (state, props) => ({
+    statuses: getTimeline(state, props.type),
     me: state.getIn(['timelines', 'me'])
-  };
+  });
+
+  return mapStateToProps;
 };
 
 const mapDispatchToProps = function (dispatch, props) {
@@ -50,4 +54,4 @@ const mapDispatchToProps = function (dispatch, props) {
   };
 };
 
-export default connect(mapStateToProps, mapDispatchToProps)(StatusList);
+export default connect(makeMapStateToProps, mapDispatchToProps)(StatusList);

app/assets/javascripts/components/reducers/timelines.jsx

@@ -40,32 +40,6 @@ const initialState = Immutable.Map({
   relationships: Immutable.Map()
 });
 
-export function selectStatus(state, id) {
-  let status = state.getIn(['timelines', 'statuses', id], null);
-
-  if (status === null) {
-    return null;
-  }
-
-  status = status.set('account', selectAccount(state, status.get('account')));
-
-  if (status.get('reblog') !== null) {
-    status = status.set('reblog', selectStatus(state, status.get('reblog')));
-  }
-
-  return status;
-};
-
-export function selectAccount(state, id) {
-  let account = state.getIn(['timelines', 'accounts', id], null);
-
-  if (account === null) {
-    return null;
-  }
-
-  return account.set('relationship', state.getIn(['timelines', 'relationships', id]));
-};
-
 function normalizeStatus(state, status) {
   // Separate account
   let account = status.get('account');

app/assets/javascripts/components/selectors/index.jsx

@@ -0,0 +1,81 @@
+import { createSelector } from 'reselect'
+import Immutable          from 'immutable';
+
+const getStatuses = state => state.getIn(['timelines', 'statuses']);
+const getAccounts = state => state.getIn(['timelines', 'accounts']);
+
+const getAccountBase         = (state, id) => state.getIn(['timelines', 'accounts', id], null);
+const getAccountRelationship = (state, id) => state.getIn(['timelines', 'relationships', id]);
+
+export const getAccount = createSelector([getAccountBase, getAccountRelationship], (base, relationship) => {
+  if (base === null) {
+    return null;
+  }
+
+  return base.set('relationship', relationship);
+});
+
+const getStatusBase = (state, id) => state.getIn(['timelines', 'statuses', id], null);
+
+export const getStatus = createSelector([getStatusBase, getStatuses, getAccounts], (base, statuses, accounts) => {
+  if (base === null) {
+    return null;
+  }
+
+  return assembleStatus(base.get('id'), statuses, accounts);
+});
+
+const getAccountTimelineIds = (state, id) => state.getIn(['timelines', 'accounts_timelines', id], Immutable.List());
+
+const assembleStatus = (id, statuses, accounts) => {
+  let status = statuses.get(id);
+
+  if (status === null) {
+    return null;
+  }
+
+  let reblog = statuses.get(status.get('reblog'), null);
+
+  if (reblog !== null) {
+    reblog = reblog.set('account', accounts.get(reblog.get('account')));
+  }
+
+  return status.set('reblog', reblog).set('account', accounts.get(status.get('account')));
+};
+
+const assembleStatusList = (ids, statuses, accounts) => {
+  return ids.map(statusId => assembleStatus(statusId, statuses, accounts)).filterNot(status => status === null);
+};
+
+export const getAccountTimeline = createSelector([getAccountTimelineIds, getStatuses, getAccounts], assembleStatusList);
+
+const getTimelineIds = (state, timelineType) => state.getIn(['timelines', timelineType]);
+
+export const makeGetTimeline = () => {
+  return createSelector([getTimelineIds, getStatuses, getAccounts], assembleStatusList);
+};
+
+const getStatusAncestorsIds = (state, id) => state.getIn(['timelines', 'ancestors', id], Immutable.OrderedSet());
+
+export const getStatusAncestors = createSelector([getStatusAncestorsIds, getStatuses, getAccounts], assembleStatusList);
+
+const getStatusDescendantsIds = (state, id) => state.getIn(['timelines', 'descendants', id], Immutable.OrderedSet());
+
+export const getStatusDescendants = createSelector([getStatusDescendantsIds, getStatuses, getAccounts], assembleStatusList);
+
+const getNotificationsBase = state => state.get('notifications');
+
+export const getNotifications = createSelector([getNotificationsBase], (base) => {
+  let arr = [];
+
+  base.forEach(item => {
+    arr.push({
+      message: item.get('message'),
+      title: item.get('title'),
+      key: item.get('key'),
+      dismissAfter: 5000
+    });
+  });
+
+  return arr;
+});

app/assets/stylesheets/components.scss

@@ -198,7 +198,7 @@
     font-size: 13px;
     display: block;
     padding: 6px 16px;
-    width: 120px;
+    width: 100px;
     text-decoration: none;
     background: #d9e1e8;
     color: #282c37;

package.json

@@ -17,15 +17,17 @@
     "es6-promise": "^3.2.1",
     "immutable": "^3.8.1",
     "moment": "^2.14.1",
+    "react-addons-perf": "^15.3.2",
     "react-addons-pure-render-mixin": "^15.3.1",
     "react-immutable-proptypes": "^2.1.0",
     "react-notification": "^6.1.1",
-    "react-redux": "^4.4.5",
+    "react-redux": "^5.0.0-beta.3",
     "react-redux-loading-bar": "^2.3.3",
     "react-router": "^2.8.0",
     "react-simple-dropdown": "^1.1.4",
     "redux": "^3.5.2",
     "redux-immutable": "^3.0.8",
-    "redux-thunk": "^2.1.0"
+    "redux-thunk": "^2.1.0",
+    "reselect": "^2.5.4"
   }
 }