How to make multiple Axios requests using a dynamic array of links in Javascript?

Question

linksArray is an array with six links.

I want to use this array to perform (6) get requests. Then, I want to take the response and setState after the response is mapped through to get the results I want.

Any help here?

getGistsDescriptions = () => {
let promiseArray = linksArray.map((url) => { return axios.get(url)});

axios.all(promiseArray)
     .then(axios.spread((...res) => {
       console.log(...res);

      /*let temp = res.map((element) => {
        return element.data;
      });*/

       //this.setState({ gistsDescriptions: temp });
     }))
     .catch((err) => {
    console.log(err);
  });
 }

I also tried this:

getGistsDescriptions = () => {
let promiseArray = linksArray.map((url) => { return axios.get(url)});

axios.all(promiseArray)
     .then((results) => {
       console.log(results);

      /*let temp = results.map((element) => {
        return element.data;
      });*/

       //this.setState({ gistsDescriptions: temp });
     })
     .catch((err) => {
    console.log(err);
  });
}

Answer 1

First thing you should do is to check whether links array contains actually contains valid links.

The following code works for me:

/* axios v0.16.2 | (c) 2017 by Matt Zabriskie */
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//# sourceMappingURL=axios.min.map

let linksArr = ['https://jsonplaceholder.typicode.com/posts', 'https://jsonplaceholder.typicode.com/comments'];

axios.all(linksArr.map(l => axios.get(l)))
  .then(axios.spread(function (...res) {
    // all requests are now complete
    console.log(res);
  }));

Alternatively, you can also use fetch and promises

// sample links
let linksArr = [undefined, undefined];

let promiseArr = linksArr.map(l => fetch(l).then(res => res.json()));

Promise.all(promiseArr).then(res => {
  /* do something with res here... */
  console.log(res);
})

Answer 2

They're just Promises

axios.all is basically Axios' polyfill for Promise.all. @D-reaper's use of fetch could just as easily implement Axios.

const getGistsDescriptions = () => {
  /* 
  I assume `getGistDescriptions` is stored as a variable or a constant. 
  If this is supposed to be a method inside a React component class, 
  the arrow function + equal sign syntax is incorrect.
  */
  let promiseArray = linksArray.map( url=> axios.get(url) );
  Promise.all( promiseArray )
  .then(
    results => {
      const gistsDescriptions = results.map( el => el.data );
      this.setState({ gistsDescriptions })
      /* 
      this is the same as 
      `{ gistsDescriptions: gistsDescriptions }`
      */
      
    }
  )
  .catch(console.log)


}

If you're up for a challenge, you also could use async/await:

const getGistsDescriptions = async () => {

  const promiseArray = linksArray.map(url=>axios.get(url));
  
  try {
  
    const gistsDescriptions = (
      await Promise.all(promiseArray)
    ).map(res=>res.data)
    
    this.setState({ gistsDescriptions })
    
  } catch(error) {
    console.error(error)
  }
  

}