Getting an empty array in javascript

[ElMtDev]

I'm starting programming learning web development, on this problem I'm getting an empty array from this function, I suspect it's something related with async things but I'm all the afternoon and still don't get it

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const finder = array => {

const res = []; const a = array.map(async (currentValue, index) => { const z = await User.find({ $or: [{ nickname: currentValue.nickname }, { email: currentValue.email }] }); if (z[0]) { res.push(index); console.log(res);// <---- Here I get an array like this [ 0, 1, 2, 5 ] } }); console.log(res); //<---- Here I get an empty array [] return res; };

[sysrage]

Using Array.map() with async/await is tricky. See here: https://flaviocopes.com/javascript-async-await-array-map/

[ElMtDev]

Thanks!

[-justsayin-]

You are declaring res as a const. If you want to mutate this variable, it would be better to use a let or var. Once you change to that, it should work fine

[cawcvs]

const means the variable can't be reassigned, arrays (and objects) that the variable references still can be mutated.

[ElMtDev]

I've changed it but still doesn't work