How can i fetch array of nested arrays sequentially?

Question

I have two nested arrays that contain urls, for example:

[['http://ex.com/1','http://ex.com/2'],['http://ex.com/3']]

How can i fetch urls from the first array simultaneously and fetch url from the second array after resolving the first array ?

using fetch and Promise.all would be a start

Bravo
– Bravo

2019-11-07 08:05:37 +00:00
Commented Nov 7, 2019 at 8:05 — Bravo
– Bravo, Commented Nov 7, 2019 at 8:05

Kasper Seweryn · Accepted Answer · 2019-11-07 08:07:28Z

1

You can use Promise.all() to fetch couple of urls at once.

async function getResponses (arr) {
  const res = []
  for (const urls of arr) {
    // Fetch all urls at once
    const responses = await Promise.all(urls.map(url => fetch(url)))
    res.push(await Promise.all(responses.map(response => response.text())))
  }

  return res
}

If your responses are in JSON then you can use

responses.map(response => response.json())

answered Nov 7, 2019 at 8:07

Kasper Seweryn

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