async/await inside arrow functions (Array#map/filter)

by

You can’t do this as you imagine, because you can’t use await if it is not directly inside an async function.

The sensible thing to do here would be to make the function passed to map asynchronous. This means that map would return an array of promises. We can then use Promise.all to get the result when all the promises return. As Promise.all itself returns a promise, the outer function does not need to be async.

const someFunction = (myArray) => {
    const promises = myArray.map(async (myValue) => {
        return {
            id: "my_id",
            myValue: await service.getByValue(myValue)
        }
    });
    return Promise.all(promises);
}

More Related Contents:

  1. Combination of async function + await + setTimeout
  2. Use async await with Array.map
  3. Correct Try…Catch Syntax Using Async/Await
  4. Waiting for more than one concurrent await operation
  5. async/await always returns promise
  6. How can I use async/await at the top level?
  7. Using async/await with a forEach loop
  8. How to “await” for a callback to return?
  9. Why are await and async valid variable names?
  10. Is there a way to wrap an await/async try/catch block to every function?
  11. How to use ES8 async/await with streams?
  12. Async/Await inside Array#map()
  13. ES8 Immediately invoked async function expression
  14. Is async await truly non-blocking in the browser?
  15. ES2017 – Async vs. Yield
  16. async/await implicitly returns promise?
  17. What’s wrong with awaiting a promise chain?
  18. Async/Await Class Constructor
  19. Why is my infinite loop blocking when it is in an async function? [duplicate]
  20. How can I wait In Node.js (JavaScript)? l need to pause for a period of time
  21. JavaScript array .reduce with async/await
  22. In JavaScript, does using await inside a loop block the loop?
  23. Use Async/Await with Axios in React.js
  24. Do Javascript promises block the stack
  25. What is the benefit of prepending async to a function that returns a promise?
  26. Does awaiting a non-Promise have any detectable effect?
  27. Puppeteer doesn’t close browser
  28. Transpile Async Await proposal with Babel.js?
  29. Implement async/await in sort function of arrays javascript
  30. JS async/await – why does await need async?

Leave a Comment