async map js

var arr = [1, 2, 3, 4, 5];

var results: number[] = await Promise.all(arr.map(async (item): Promise<number> => {
    await callAsynchronousOperation(item);
    return item + 1;
}));

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4.14

Phoenix Logan 186120 points

                                    const list = [1, 2, 3, 4, 5] //...an array filled with values

const functionWithPromise = item =&gt; { //a function that returns a promise
  return Promise.resolve('ok')
}

const anAsyncFunction = async item =&gt; {
  return functionWithPromise(item)
}

const getData = async () =&gt; {
  return Promise.all(list.map(item =&gt; anAsyncFunction(item)))
}

getData().then(data =&gt; {
  console.log(data)
})

Thank you! 7

4.14 (7 Votes)

Phoenix Logan 186120 points

                                    Arr = await Promise.all(arr)

Thank you! 3

5 (3 Votes)

3.5

Phoenix Logan 186120 points

                                    const list = [1, 2, 3, 4, 5] //...an array filled with values

const functionThatReturnsAPromise = item =&gt; { //a function that returns a promise
  return Promise.resolve('ok')
}

const doSomethingAsync = async item =&gt; {
  return functionThatReturnsAPromise(item)
}

const getData = async () =&gt; {
  return Promise.all(list.map(item =&gt; doSomethingAsync(item)))
}

getData().then(data =&gt; {
  console.log(data)
})

Thank you! 9

3.5 (8 Votes)

4.33

Krish 100200 points

                                    let obj = {
  one: 1,
  two: 2,
  three: 3
}

obj.map((element, index) =&gt; {
  // do something
  // return result
});

/*
  map() is a higher order function (a function that takes another
  function as a parameter) and as such is synchronous
*/

Thank you! 3

4.33 (3 Votes)

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