Axios spread() with unknown number of callback parameters

Question

I need to process an unknown number of AJAX requests (1 or more) with axios, and I am not sure how to handle the response. I want something along the lines of:

let urlArray = [] // unknown # of urls (1 or more) axios.all(urlArray) .then(axios.spread(function () { let temp = []; for (let i = 0; i < arguments[i].length; i++) temp.push(arguments[i].data); }));

where arguments will contain the callback responses sent by axios. The problem is that arguments contains the given string urls instead of the actual responses. How can I resolve this problem?

Bergi · Accepted Answer · 2016-05-10 21:48:21Z

45

You somewhere will need to make the actual requests. And then don't use spread but only then to receive the array of results:

let urlArray = [] // unknown # of urls (1 or more) let promiseArray = urlArray.map(url => axios.get(url)); // or whatever axios.all(promiseArray) .then(function(results) { let temp = results.map(r => r.data); … });

answered May 10, 2016 at 21:48

Bergi

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2 Comments

Micheal J. Roberts Over a year ago

I'm pretty sure you need the spread ... My results are just Array(3) [ undefined, undefined, undefined ]

Bergi Over a year ago

@MichealJ.Roberts If you are getting an array, and want to work with an array instead of three specific values, then you should not use spread (and even if you do, just use modern destructuring syntax instead of spread). If your problem is that you get undefined instead of some expected value, that has nothing to do with spread but with the function that is creating your promises.

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