correct way to handle errors inside a Promise

Question

Currently, I\'m trying to decide what pattern I should use while dealing with errors inside a Promise. For instance, I have the code below

promiseFunc()
.the         


        

Answer 1

You are throwing an error in an asynchronous function, instead of rejecting the promise.

Change throw Error("") to reject(""):

promiseFunc()
  .then(result => {
    console.info(`.THEN:: ${result}`)
  })
  .catch(error => {
    console.info(`.CATCH:: ${error}`)
  })

function promiseFunc() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      reject("setTimeout's callback error")
      resolve('resolution')
    }, 1000)
  })
}

Or add a try-catch statement, and reject it in the catch block

setTimeout(() => {
  try {
    throw new Error("setTimeout's callback error")
  } catch(error) {
    reject(error)
  }
  resolve('resolution')
}, 1000)