从 function 中更新全局变量

Question

I am defining two variables:

var information;
var secondary_information;

I update these variables within my function:

async function fetchInfo() {
var num = Math.floor(Math.random() * 20 + 1);

const url = `https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=${pos.current.coords.latitude},${pos.current.coords.longitude}&radius=12000&type=restaurant&key=${key}`;

await fetch(url)
  .then((response) => response.json())
  .then((data) => setSearchResponse(data))
  .then(console.log("api request fired."));

let place_id = searchResponse.results[num].place_id;


const secondary_url = `https://maps.googleapis.com/maps/api/place/details/json?fields=formatted_phone_number,opening_hours,formatted_address&place_id=${place_id}&key=${key}`;

await fetch(secondary_url)
  .then((response) => response.json())
  .then((data) => setsecondarySearchResponse(data))
  .then(console.log("secondary api request fired."));

 information = {
  name: searchResponse.results[num].name,
  open_now: searchResponse.results[num].opening_hours.open_now,
  rating: searchResponse.results[num].rating,
  price: searchResponse.results[num].price_level
};

 secondary_information = {
  phone_number: secondarySearchResponse.result.formatted_phone_number,
  daily_hours: secondarySearchResponse.result.opening_hours.weekday_text,
  address: secondarySearchResponse.result.formatted_address
};
}

When I console log the variables from within the function it works as intended.

I am trying to pass the variables down as props to a react component but it keeps passing an empty object instead:

return (
<div className="App">
  <Filters />
  <Button variant="primary" onClick={fetchInfo}>
    Randomizer
  </Button>{" "}
  <Result info={information} />
</div>
);

Additionally, I have no clue if this is the correct way I should be going about making these API calls and storing them into state but this is the way that made sense to me. Any feedback is greatly appreciated.

Answer 1

You should be using useState in react to store your variables. how to use

Creating

const [information, setInformation] = useState(null);

Updateing

setInformation({
  name: searchResponse.results[num].name,
  open_now: searchResponse.results[num].opening_hours.open_now,
  rating: searchResponse.results[num].rating,
  price: searchResponse.results[num].price_level
})

Then passing the state to props should stay the same.

<Result info={information} />