MaxInterview - promise all in promise all

showing results for - "promise all in promise all"

1var arr = [
2  {subarr: [1,2,3]},
3  {subarr: [4,5,6]},
4  {subarr: [7,8,9]}
5];
6function processAsync(n) {
7  return new Promise(function(resolve) {
8    setTimeout(
9      function() { resolve(n * n); },
10      Math.random() * 1e3
11    );
12  });
13}
14Promise.all(arr.map(function(entity){
15  return Promise.all(entity.subarr.map(function(item){
16    return processAsync(item);
17  }));
18})).then(function(data) {
19  console.log(data);
20});

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