retrieve the value obtained from a promise in an outer scope

Question

retrieve the value obtained from a promise in an outer scope

I need a simple function that returns the name. Here's my existing code snippet:

        getName(entity, id) {
            const promise = userServices.getName(entity, id).then((data) => {
                return data;
            });
            //I want to access and return the 'data' value here
        }

I am currently working with vue and I understand that I can create another data() variable, but I prefer not to do so for just one function. Is there an alternative solution? Can I define a variable within the function that is accessible inside the promise?

javascript vue.js

Answer 1

Answer №1

It seems like your goal may be unattainable. The integration of asynchronous data into synchronous code can pose challenges, which is why promises were created to address this issue.

There are essentially two options available to you:

Utilize async/await

async getName(entity, id) {
    await data = userServices.getName(entity, id);
    return data;
};

While this approach may seem promising, it's important to remember that async functions ultimately still operate asynchronously with the use of promises under the hood. When calling getName in your main code, it will enter the event loop and only execute once the primary code has completed.

Return the promise

getName(entity, id) {
    return userServices.getName(entity, id);
}

This method allows you to chain the .then function outside of the initial function within the main code scope. This enables you to access variables, invoke functions, or update state within the main code using the returned value. However, keep in mind that this value will only be accessible within the specific .then block and remains an asynchronous operation.

Answer 2

It seems like your goal may be unattainable. The integration of asynchronous data into synchronous code can pose challenges, which is why promises were created to address this issue.

There are essentially two options available to you:

Utilize async/await

async getName(entity, id) {
    await data = userServices.getName(entity, id);
    return data;
};

While this approach may seem promising, it's important to remember that async functions ultimately still operate asynchronously with the use of promises under the hood. When calling getName in your main code, it will enter the event loop and only execute once the primary code has completed.

Return the promise

getName(entity, id) {
    return userServices.getName(entity, id);
}

This method allows you to chain the .then function outside of the initial function within the main code scope. This enables you to access variables, invoke functions, or update state within the main code using the returned value. However, keep in mind that this value will only be accessible within the specific .then block and remains an asynchronous operation.

retrieve the value obtained from a promise in an outer scope

Answer №1

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