如何将一个异步 function 的结果用于另一个

Question

I am trying to use the latitude and longitude coordinates on an ISS api ( https://api.wheretheiss.at/v1/satellites/25544 ) in the url of another api (https://api.wheretheiss.at/v1/coordinates/37.795517,-122.393693 ). I am trying to use the coordinates and input them in the url instead of using the hard coded ones.

This is what I have done so far...

• I have tried using a template string to make the coordinates dynamic: https://api.wheretheiss.at/v1/coordinates/${latitude},${longitude}
• I have made two separate async await functions: (1) getISS() to get the lat/ lon coordinates and (2) getGeoLocation() to take those coordinates and get the country_code/ timecode_id data
• I have also tried calling the getGeoLocation() with latitude,longitude as arguments and passing them into latitude and longitude for the parameters, but this only results in a 500 error

Note

• I know both url api's work because I have tested them and received the data I was looking for
• This is the api website https://wheretheiss.at/w/developer

 const api_url_id = 'https://api.wheretheiss.at/v1/satellites/25544' //async await getISS function async function getISS() { const response = await fetch(api_url_id) const data = await response.json() const { latitude, longitude, velocity, visibility } = data } async function getGeoLocation(latitude, longitude) { const response2 = await fetch(`https://api.wheretheiss.at/v1/coordinates/${latitude},${longitude}`) const data2 = await response2.json() const { timezone_id, country_code } = data2 console.log(data2.timezone_id,country_code) } getGeoLocation(data.latitude, data.longitude) getISS()

Answer 1

async functions returns a promise , so you can use .then()

You should return the data from getISS and use .then() , like this...

// getISS function returns data
async function getISS() {
  const response = await fetch(api_url_id);
  const data = await response.json();
  return data;
}

Call your getISS function, using then to later call getGeoLocation with the necessary data

getISS().then(({ latitude, longitude }) => {
  getGeoLocation(latitude, longitude);
});