Removed unused factory and fixed index based mapper lookup

public/app/core/redux/reducerFactory.ts

-import { ActionOf, ActionCreator, actionCreatorFactory } from './actionCreatorFactory';
+import { ActionOf, ActionCreator } from './actionCreatorFactory';
 import { Reducer } from 'redux';
 
 export type Mapper<State, Payload> = (state: State, action: ActionOf<Payload>) => State;
@@ -17,23 +17,23 @@ export interface CreateReducer<State> extends AddMapper<State> {
 }
 
 export const reducerFactory = <State>(initialState: State): AddMapper<State> => {
-  const allMapperConfigs: Array<MapperConfig<State, any>> = [];
+  const allMappers: { [key: string]: Mapper<State, any> } = {};
 
   const addMapper = <Payload>(config: MapperConfig<State, Payload>): CreateReducer<State> => {
-    if (allMapperConfigs.some(c => c.filter.type === config.filter.type)) {
-      throw new Error(`There is already a Mappers defined with the type ${config.filter.type}`);
+    if (allMappers[config.filter.type]) {
+      throw new Error(`There is already a mapper defined with the type ${config.filter.type}`);
     }
 
-    allMapperConfigs.push(config);
+    allMappers[config.filter.type] = config.mapper;
 
     return instance;
   };
 
   const create = (): Reducer<State, ActionOf<any>> => (state: State = initialState, action: ActionOf<any>): State => {
-    const mapperConfig = allMapperConfigs.filter(config => config.filter.type === action.type)[0];
+    const mapper = allMappers[action.type];
 
-    if (mapperConfig) {
-      return mapperConfig.mapper(state, action);
+    if (mapper) {
+      return mapper(state, action);
     }
 
     return state;
@@ -43,95 +43,3 @@ export const reducerFactory = <State>(initialState: State): AddMapper<State> =>
 
   return instance;
 };
-
-/** Another type of fluent reducerFactory */
-
-export interface FilterWith<State> {
-  filterWith: <Payload>(actionCreator: ActionCreator<Payload>) => MapTo<State, Payload>;
-}
-
-export interface OrFilterWith<State> {
-  orFilterWith: <Payload>(actionCreator: ActionCreator<Payload>) => MapTo<State, Payload>;
-}
-
-export interface MapTo<State, Payload> {
-  mapTo: (mapper: Mapper<State, Payload>) => CreateReducerEx<State>;
-}
-
-export interface CreateReducerEx<State> extends OrFilterWith<State> {
-  create: () => Reducer<State, ActionOf<any>>;
-}
-
-export const reducerFactoryEx = <State>(initialState: State): FilterWith<State> => {
-  const allMapperConfigs: Array<MapperConfig<State, any>> = [];
-
-  const innerMapTo = (actionCreator: ActionCreator<any>, mapper: Mapper<State, any>): CreateReducerEx<State> => {
-    allMapperConfigs.filter(config => config.filter.type === actionCreator.type)[0].mapper = mapper;
-
-    return instance;
-  };
-
-  const filterWith = <Payload>(actionCreator: ActionCreator<Payload>): MapTo<State, Payload> => {
-    if (allMapperConfigs.some(c => c.filter.type === actionCreator.type)) {
-      throw new Error(`There is already a mapper defined with the type ${actionCreator.type}`);
-    }
-
-    allMapperConfigs.push({ filter: actionCreator, mapper: null });
-
-    const mapTo = <Payload>(mapper: Mapper<State, Payload>): CreateReducerEx<State> => {
-      innerMapTo(actionCreator, mapper);
-
-      return instance;
-    };
-
-    return { mapTo };
-  };
-
-  const orFilterWith = <Payload>(actionCreator: ActionCreator<Payload>): MapTo<State, Payload> => {
-    if (allMapperConfigs.some(c => c.filter.type === actionCreator.type)) {
-      throw new Error(`There is already a mapper defined with the type ${actionCreator.type}`);
-    }
-
-    allMapperConfigs.push({ filter: actionCreator, mapper: null });
-
-    const mapTo = <Payload>(mapper: Mapper<State, Payload>): CreateReducerEx<State> => {
-      innerMapTo(actionCreator, mapper);
-
-      return instance;
-    };
-
-    return { mapTo };
-  };
-
-  const create = (): Reducer<State, ActionOf<any>> => (state: State = initialState, action: ActionOf<any>): State => {
-    const mapperConfig = allMapperConfigs.filter(config => config.filter.type === action.type)[0];
-
-    if (mapperConfig) {
-      return mapperConfig.mapper(state, action);
-    }
-
-    return state;
-  };
-
-  const instance = { filterWith, orFilterWith, create };
-
-  return instance;
-};
-
-interface TestState {
-  data: string[];
-}
-
-const initialState: TestState = {
-  data: [],
-};
-
-const dummyActionCreator = actionCreatorFactory<string>('dummyActionCreator').create();
-const dummyActionCreator2 = actionCreatorFactory<number>('dummyActionCreator2').create();
-
-export const reducerFactoryExReducer = reducerFactoryEx<TestState>(initialState)
-  .filterWith(dummyActionCreator)
-  .mapTo((state, action) => ({ ...state, data: state.data.concat(action.payload) }))
-  .orFilterWith(dummyActionCreator2)
-  .mapTo((state, action) => ({ ...state, data: state.data.concat(`${action.payload}`) }))
-  .create();