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

Similar questions

Is it better to modify attributes during the ng-repeat cycle or after the cycle ends?

Vue - Struggling to invoke sweetalert2 within a method

Is there a way to enlarge an iFrame to fill the entire screen with just a button click, without using JavaScript

Encounters a fault while processing the php output

Utilizing a custom function to filter Firestore collection data based on location proximity

Implement an onClick event to the newly created th element using document.createElement()

Angular mistakenly uses the incorrect router-outlet

What is the best way to make a click handler respond to any click on an "a" tag, regardless of its surrounding elements?

Communicating PHP variables with JavaScript through AJAX in a chat application

Exploring the utilization of props in single file components with Vue.js

Experience an enthralling carousel feature powered by the dynamic ContentFlow.js

Move your cursor over the image to activate the effect, then hover over it again to make the effect disappear

Angular2 does not load Js twice

Reaching out to the Edge: Enhancing the jQuery Slider Experience

JavaScript toggle display function not functioning properly when clicked

Angular: Error when TypeScript object returns an array object value

Retrieve JavaScript functions as JSON or text in AngularJS and execute them

Calculate the number of days required for the value in an item to multiply by two

The controller element in AngularJS becomes undefined when invoked within a directive

Does the gltf loader in three.js have compatibility issues with Internet Explorer 11?