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Javascript Map Promise All
You can do the same thing with a for loop if you want. The first promise in the array will get resolved to the first element of the output array, the second promise will be a second element in the output array and so on. Fyi,.map () is just a plain loop.
Async/Await With Javascript's Map Method: Using Promise.all - Dev Community from dev.to
You would use promise.all () on the array of returned promises to know when they are all done and/or to collect their resolved results. Here, promise.all () method is the order of the maintained promises. 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 input promises.
Promises.all () collects a bunch of promises, and rolls them up into a single promise.
That's where promises.all () comes in. The first promise in the array will get resolved to the first element of the output array, the second promise will be a second element in the output array and so on. 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 input promises. Promises.all () collects a bunch of promises, and rolls them up into a single promise.
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