masa7351

List<S> dedupe<T, S>(List<S> values, T Function(S) key) {
  var valuesSet = <T>{};
  List<S> results = [];
  for (var element in values) {
    if (!valuesSet.contains(key(element))) {
      valuesSet.add(key(element));
      results.add(element);
    }
  }
  return results;

masa7351

テキストエディター

目的	Visual Studio Code	IntelliJ	補足
行複製	Option + Shift + ↑ or ↓	Command + D	Option + Shift + ↑ or ↓はIntelliJでは行入れ替えのショートカットキー
行削除	Command + Shift + K Command + X ※ ※ Clipbordに登録されるので、Command + Vで貼り付けできる	Command + Delete
行追加※行末にいない状態で追加	Command + EnterCommand + Shift + Enter ※※ Shiftをつけてると、上に行が追加される	Shif

masa7351

export default createReducer(initialState, {
  [types.INCREMENT](state) {
    return Object.assign({}, state, {value: state.value + 1});
  },
  [types.DECREMENT](state) {
    return Object.assign({}, state, {value: state.value - 1});
  },
});

masa7351

import { createStore } from 'redux';
import rootReducer from '../reducers';

export default function configureStore(initialState) {
  const store = createStore(
    rootReducer,
    initialState,
  );
  return store;
}

masa7351

// handersには(state, action) => stateのreducerが渡される
export function createReducer(initialState: Object, handlers: Object): Function {
    return function reducer(state: Object = initialState, action: Object): Object {
      if ({}.hasOwnProperty.call(handlers, action.type)) {
        // [ ]はaction.typeをKeyにしたreducerを返却
        return handlers[action.type](state, action);
      }
      return state;
    };
}

masa7351

import { createStore } from 'redux';
import rootReducer from '../reducers';

export default function configureStore(initialState) {
  const store = createStore(
    rootReducer,
    initialState,
  );
  return store;
}