如何重構redux-saga生成器函數？

Question

我是redux-saga和generator函數的新手。

從我的sagas.js代碼中可以看到，有重復的邏輯：

import { put, takeEvery, takeLatest, all, call } from 'redux-saga/effects';
import { setRandomColour, SET_RANDOM_COLOUR_DELAYED } from './actions';

const delay = (ms) => new Promise(res => setTimeout(res, ms));

export function* setRandomColourGeneratorLatest({ payload: { id, ms, sagaType } = {}} = {}){
  if(sagaType !== 'takeLatest') return;
  console.log("set random colour", id, ms);
  yield call(delay, ms);
  yield put(setRandomColour(id));
}
export function* setRandomColourGeneratorEvery({ payload: { id, ms, sagaType } = {}} = {}){
  if(sagaType !== 'takeEvery') return;
  console.log("set random colour", id, ms);
  yield call(delay, ms);
  yield put(setRandomColour(id));
}

export function* watchSetRandomColourLatest(){
  yield takeLatest(SET_RANDOM_COLOUR_DELAYED, setRandomColourGeneratorLatest)
}
export function* watchSetRandomColourEvery(){
  yield takeEvery(SET_RANDOM_COLOUR_DELAYED, setRandomColourGeneratorEvery)
}

export default function* rootSaga(){
  yield all([
    watchSetRandomColourLatest(),
    watchSetRandomColourEvery()
  ])
}

因此，我嘗試通過放置yield調用並將yield放入單個生成器函數中，然后在setRandomColourGeneratorLatest / Every中調用它來重構它，但是無論如何，我都無法使代碼保持運行狀態。 我相信這是因為收益率取決於生成器函數的上一次調用，而在這種情況下，生成器函數必須有2個單獨的版本。

我如何重構此代碼以減少重復的邏輯，同時分離takeEvery和takeLatest版本的收益？

Answer 1

您是否正在尋找這樣的東西？ 您的代碼中實際上並沒有太多重復...老實說，它會保留原樣，因為setRandomColourGeneratorLatest和setRandomColourGeneratorEvery之間的通用代碼在某些時候可能會有所不同，因此您必須不進行干燥您的代碼。

import { put, takeEvery, takeLatest, all, call } from 'redux-saga/effects';
import { setRandomColour, SET_RANDOM_COLOUR_DELAYED } from './actions';

const delay = (ms) => new Promise(res => setTimeout(res, ms));

export function* setRandomColourGeneratorLatest({ payload: { id, ms, sagaType } = {}} = {}){
  if(sagaType !== 'takeLatest') return;
  console.log("set random colour", id, ms);
  yield call(setRandomColor, ms, id);
}
export function* setRandomColourGeneratorEvery({ payload: { id, ms, sagaType } = {}} = {}){
  if(sagaType !== 'takeEvery') return;
  console.log("set random colour", id, ms);
  yield call(setRandomColor, ms, id);
}

export function* setRandomColor(ms, id){
  yield call(delay, ms);
  yield put(setRandomColour(id));
}

export function* watchSetRandomColourLatest(){
  yield takeLatest(SET_RANDOM_COLOUR_DELAYED, setRandomColourGeneratorLatest)
}
export function* watchSetRandomColourEvery(){
  yield takeEvery(SET_RANDOM_COLOUR_DELAYED, setRandomColourGeneratorEvery)
}

export default function* rootSaga(){
  yield all([
    watchSetRandomColourLatest(),
    watchSetRandomColourEvery()
  ])
}