function all(promises) {
console.log(promises)
return new Promise((res, rej) =&gt; {
let counter = 0
const result =[]
<pre><code>if (promises.length === 0) {
 res(result)
 return
}

for(let item of promises) {
 Promise.resolve(item).then((data) =&gt; {
 result.push(data)
 counter++
 if (counter === promises.length) {
 res(result)
 }
 }).catch(rej)
}
</code></pre>
})
}
all([undefined, Promise.resolve(1)])

Polyfill Promise.all

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> The Promise.all() method takes an iterable of promises as an input, and returns a single Promise that resolves to an array of the results of the inp…