添加功能：pretest discuss user dashboard statistics

ui/components/scratchpad/reducers/pretest.js

@@ -1,5 +1,4 @@
 import { v4 as uuid } from 'uuid';
-import _ from 'lodash';
 
 const initialId = uuid();
 
@@ -23,67 +22,6 @@ export default function reducer(state = {
   },
 }, action) {
   switch (action.type) {
-  case 'SCRATCHPAD_PRETEST_SWITCH_TO_DATA': {
-    const currentId = action.payload;
-    return {
-      ...state,
-      current: currentId,
-    };
-  }
-  case 'SCRATCHPAD_PRETEST_ADD_DATA': {
-    const newCounter = state.counter + 1;
-    const newId = uuid();
-    return {
-      ...state,
-      counter: newCounter,
-      current: newId,
-      tabs: [...state.tabs, newId],
-      meta: {
-        ...state.meta,
-        [newId]: {
-          id: newId,
-          title: `#${newCounter}`,
-        },
-      },
-      data: {
-        ...state.data,
-        [newId]: {
-          id: newId,
-          input: '',
-          output: '',
-        },
-      },
-    };
-  }
-  case 'SCRATCHPAD_PRETEST_REMOVE_DATA': {
-    const orgIdx = state.tabs.indexOf(state.current);
-    let newCounter = state.counter;
-    const newTabs = _.without(state.tabs, state.current);
-    const newMeta = _.omit(state.meta, state.current);
-    const newData = _.omit(state.data, state.current);
-    if (newTabs.length === 0) {
-      // keep at least one data
-      const id = uuid();
-      newTabs.push(id);
-      newMeta[id] = {
-        id,
-        title: `#${++newCounter}`,
-      };
-      newData[id] = {
-        input: '',
-        output: '',
-      };
-    }
-    const newIdx = (orgIdx < newTabs.length) ? orgIdx : orgIdx - 1;
-    return {
-      ...state,
-      counter: newCounter,
-      current: newTabs[newIdx],
-      tabs: newTabs,
-      meta: newMeta,
-      data: newData,
-    };
-  }
   case 'SCRATCHPAD_PRETEST_DATA_CHANGE': {
     const { id, type, value } = action.payload;
     return {