async Do While loop

Question

I need to pull data from an API, but it sends me the data in pages of 100 + the total count of results. The way I tried doing is

let count, page = 0;
do {
    ++page
    pullData(page, () => {
        count = data.count
    });
} while (page < count / 100);

but the code checks the condition of the loop before count is initialized (page < undefined / 100), and the loop ends up running only the first time.

Is there a way to make the loop wait for the async body to run before checking the condition?

I tried both await count = data.count and await pullData with no success — Guilherme Raposo
– Guilherme Raposo, Commented Nov 19, 2020 at 5:16
If pullData returns a promise that should work, but if it expects a callback function then you need to "promisify" it first. — tadman
– tadman, Commented Nov 19, 2020 at 5:21
For await to work, pullData must return a Promise, and await keyword must be used inside function with async keyword before function, like async function Foo () .... — Anastazy
– Anastazy, Commented Nov 19, 2020 at 5:21

heydar dasoomi · Accepted Answer · 2020-11-19 05:19:16Z

1

Use async/await or recursive functions like this:

const recursive = (page) => {
    pullData(page, () => {
        count = data.count;
        if (page < count / 100) {
            recursive(++page)
        }
    })
}

answered Nov 19, 2020 at 5:19

heydar dasoomi

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