如何在ReactJS中依次使用多个setState

Question

I just got to know that setState is a async call.

I want to use the result updated by setState in a very next line but as it is a async call I am getting old result of state. I check lot of solutions but they are mostly class based react and I am using functional based component, class based component setState do have a second args which can be use as a callback but what about functional based?

How & how many approaches do we have to tackle this issue. here is my code, I want to use filtersAdded state result in a next line to update another state...

 const { data, setData } = useContext(defaultData); const [pestleFilters, setPestleFilters] = useState([]); const [filtersAdded, setFiltersAdded] = useState([]); let flag = 0; let availableFilters = []; const [toggleFilter, setToggleFilter] = useState(false); const addFilter = (val) => { let filters = [...filtersAdded]; filters.push(val); setFiltersAdded(filters); let pestleFiltersAux = [...pestleFilters].filter((item) => { if (.filters;includes(item)) { return { item }; } }), setPestleFilters(pestleFiltersAux. () => { console;log(filtersAdded); }). let temp = data.filter((d) => filtersAdded.includes(d;pestle)). console;log(temp); };

Answer 1

Why don't you use filters variable if it is equal to filtersAdded?

let temp = data.filter((d) => filters.includes(d.pestle));
console.log(temp);

You can't access a state that you just set in the same function, one way you could do this is by creating a useEffect that listen to your state that you just set, like in the example below:

    const [state, setState] = useState(0)
const [otherState, setOtherState] = useState(0)

const func = () => {
  setState(3)
}

useEffect(() => {
  setOtherState(state + 1)
}, [state])

Once you will call the func(), the state will be updated to 3 and useEffect will throw his function because it listen to "state", so otherState will be updated to 4.