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JavaScript Asynchronous Code in Express Asynchronous Code in Express Refactor Using Async/Await

Luis Walderdorff
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Luis Walderdorff
Full Stack JavaScript Techdegree Graduate 27,070 Points
Posted by Luis Walderdorff
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Luis Walderdorff
Full Stack JavaScript Techdegree Graduate 27,070 Points

I don't understand the async keyword.

Would it transform the getUsers function into a promise if it wasn't one?

1 Answer

Steven Parker
Steven Parker
231,261 Points
Steven Parker
Steven Parker
231,261 Points

You're right, even If a function returns a non-promise value, prepending the function definition with the “async” keyword directs JavaScript to automatically wrap that value in a resolved promise. For example:

async function f() {          // this function is the same...
  return 1;
}
async function f() {          // ...as this one
  return Promise.resolve(1);
}
JASON LEE
JASON LEE
17,352 Points

Shouldn't the return Promise.resolve(1); in this example be return new Promise.resolve(1)? Just trying to understand how it all ties together.

Steven Parker
Steven Parker
231,261 Points
Steven Parker
Steven Parker
231,261 Points

This code isn't invoking a constructor directly, it's calling a class method. The class method "resolve" creates a new promise internally and returns it.