Clean Way To Wait For First True Returned By Promise

Waiting for the first resolved promise to return true in your JavaScript code? We've got you covered with a clean and efficient method to achieve this! Promises play a crucial role in handling asynchronous operations in JavaScript, and properly managing them is essential for creating reliable and responsive code.

One common scenario developers face is waiting for the first promise to resolve to true before proceeding further. This can be tricky, especially when dealing with multiple promises. Fortunately, there is a simple and elegant solution to address this challenge.

To accomplish this, we can leverage the Promise.race() method, which allows us to settle for the first promise that resolves, whether it's true or false. Here's a step-by-step guide on how to implement this approach in your code:

Step 1: Create an array of promises
The first step is to create an array containing all the promises you want to evaluate. Each promise should represent an asynchronous operation that returns a boolean value.

Javascript

const promises = [
  promise1(),
  promise2(),
  promise3()
];

Step 2: Define a function for checking the value
Next, define a function that checks if the value returned by the promise is true. This function will be used as the callback for the Promise.race() method.

Javascript

const checkForTrue = (value) =&gt; {
  return value === true;
};

Step 3: Implement the logic using Promise.race()
Now, use the Promise.race() method to wait for the first promise to resolve to true.

Javascript

const firstTruePromise = () =&gt; {
  return Promise.race(promises.map(p =&gt; p.then(result =&gt; {
    if (checkForTrue(result)) {
      return Promise.resolve(result);
    } else {
      return Promise.reject(result);
    }
  }));
};

Step 4: Handle the result
Finally, handle the result returned by the first promise that resolves to true.

Javascript

firstTruePromise()
  .then(result =&gt; {
    console.log('First true promise resolved with:', result);
    // Add your code logic here
  })
  .catch(error =&gt; {
    console.error('No promise resolved to true:', error);
    // Handle the case where no promise resolves to true
  });

By following these steps, you can effectively wait for the first promise to return true in a clean and structured manner. This approach ensures that your code remains concise, readable, and easy to maintain, even when dealing with complex asynchronous scenarios.

In conclusion, mastering the art of handling promises in JavaScript can significantly enhance the reliability and performance of your applications. By utilizing techniques like Promise.race() to wait for the first true promise, you can streamline your code and deliver a seamless user experience. Apply these concepts in your projects and witness the power of efficient asynchronous programming!

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