The map function An async version needs to do two things. First, it needs to map every item to a Promise with the new value, which is what adding async before the function does. And second, it needs to wait for all the Promises then collect the results in an Array. Fortunately, the Promise.

What exactly is async?

Async enables the use of the await keyword in the method. A method marked with an async keyword, executes like any other function until it gets to the line with the await keyword.

Is map sync or async?

map is a synchronous function.