如果在具有后续状态更新的异步效果期间卸载了react组件,则会遇到一个警告,指出它指示内存泄漏。
const [value, setValue] = useState('checking value...');
useEffect(() => {
fetchValue().then(() => {
setValue("done!"); // ⚠️ what if the component is no longer mounted ?
// we got console warning of memory leak
在Haskell书中关于Monoids的一章中,我正在编写quickcheck测试
semigroupAssoc :: (Eq m, S.Semigroup m) => m -> m -> m -> Bool
semigroupAssoc a b c =
(a S.<> (b S.<> c)) == ((a S.<> b) S.<> c)
type IdentAssoc = Identity String -> Identity String -> Identity String -> Bool
我尝试在useEffect中更新数据,但在控制台中显示警告。
React Hook useEffect has missing dependencies: 'dispatch', 'id', and 'state.selectedHotel'. Either include them or remove the dependency array react-hooks/exhaustive-deps
码
import { GlobalContext } from "../../../context/globalContext";