Run Async function and get result and error without try catch.

runAsync.js

/**
 * Run Async function and get the result and the error without using try catch.
 *
 * @author  Sajeeb Ahamed <[email protected]>
 */
const runAsync = (func) => func.then((data) => [data, undefined]).catch((error) => Promise.resolve([undefined, error]));

//  A function which will return a promise and throw error
const getData = () => {
  return new Promise((_, reject) => {
    setTimeout(() => reject('Error message'), 1000);
  });
}

async function main() {

  // Catch error using try/catch
  try {
    const res = await getData();
  } catch (err) {
    console.error(err); // console `Error message` 
  }
  
  // Catch error using runAsync function
  const [data, err] = await runAsync(getData());
  console.error(err); // console `Error message` 
}

main();