Question

14

When should I use try catch instead of then catch?

rated 0 times [ 20] [ 6] / answers: 1 / hits: 7923 / 3 Years ago, tue, september 28, 2021, 12:00:00

The question is simple, but I haven't found the answer anywhere.

When should i use try catch? in the code below I use try catch to handle the return of a request:

async findUsers() {

    this.loading = true;



    try {

        const [users, count] = await this.api.get('/users/list');



        this.users = users;

        this.totalPages = Math.ceil(parseInt(count) / 10);

    }

    catch (error) {

        this.Messages.requestFailed(error);

    }

    finally {

        this.loading = false;

    }

}

Would it be a good practice to use then(...).catch(...)?

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

leighrheac

Add To Favorites

Follow

Total Points: 313

Total Questions: 92

Total Answers: 94

Location: Papua New Guinea

Member since Thu, May 7, 2020

4 Years ago

answered 3 Years ago aliah · Accepted Answer

The difference is in how you're handing Promises.

If you're using await to handle the Promise then you wrap it in a try/catch. Think of await as a way to make asynchronous operations semantically similar to synchronous operations.

But if you're not using await and are instead handling the Promise by appending .then() to it then you'd append a .catch() to that chain to catch failures from within the asynchronous operation.

Because a try/catch isn't going to catch an exception that happens from within the asynchronous operation if that operation isn't awaited.