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(...)?

CodePudding user response：

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.

CodePudding user response：

When you use promises(asynchronous operations) then you need to handle the exception in case of an error. So In this case you can use .then().catch(err) {}

When you have synchronous code, use try/catch for exception handling.