Correct Try…Catch Syntax Using Async/Await

Question

I like the flatness of the new Async/Await feature available in Typescript, etc. However, I\'m not sure I like the fact that I have to declare the variable I\'m

Answer 1

@Bergi Answer is good, but I think it's not the best way because you have to go back to the old then() method, so i think a better way is to catch the error in the async function

async function someAsyncFunction(){
    const createdUser = await this.User.create(userInfo);

    console.log(createdUser)
}

someAsyncFunction().catch(console.log);

• But what if we have many await in the same function and need to catch every error?

You may declare the to() function

function to(promise) {
    return promise.then(data => {
        return [null, data];
    })
    .catch(err => [err]);
}

And then

async function someAsyncFunction(){
    let err, createdUser, anotherUser;

    [err, createdUser] = await to(this.User.create(userInfo));

    if (err) console.log(`Error is ${err}`);
    else console.log(`createdUser is ${createdUser}`);


    [err, anotherUser] = await to(this.User.create(anotherUserInfo));

    if (err) console.log(`Error is ${err}`);
    else console.log(`anotherUser is ${anotherUser}`);
}

someAsyncFunction();

When reading this its: "Wait to this.User.create".

Finally you can create the module "to.js" or simply use the await-to-js module.

You can get more information about to function in this post