Es7 Getting Result From An Array Of Promises Using Await Generator

Are you looking to level up your coding skills and delve into ES7 features? Well, you're in luck because today, we're going to discuss how to get results from an array of promises using the await generator technique. This advanced ES7 feature can be incredibly handy when working with asynchronous operations in your JavaScript programs.

First things first, let's break down the concept of promises. Promises in JavaScript are objects that represent the eventual completion or failure of an asynchronous operation. They are widely used to handle asynchronous operations such as fetching data from a server or reading a file.

Now, let's talk about ES7 and the await keyword. ES7, also known as ECMAScript 2016, introduced the async/await syntax as a way to simplify working with asynchronous code. The await keyword can only be used inside a function that's declared with the async keyword. When you use await, it pauses the execution of the async function until the promise is settled (that is, fulfilled or rejected).

So, how do we utilize the await generator technique to handle an array of promises effectively? Let's walk through the process step by step:

Step 1: Define an async function that utilizes the await keyword. This function will be responsible for handling the array of promises.

Javascript

async function handlePromises(promisesArray) {
    let results = [];

    for (const promise of promisesArray) {
        results.push(await promise);
    }

    return results;
}

In the `handlePromises` function, we iterate over each promise in the `promisesArray` and use the await keyword to wait for each promise to resolve before pushing the result into the `results` array.

Step 2: Call the `handlePromises` function with an array of promises. Here's an example to illustrate this:

Javascript

const promisesArray = [
    fetch('https://api.example.com/data/1'),
    fetch('https://api.example.com/data/2'),
    fetch('https://api.example.com/data/3')
];

handlePromises(promisesArray)
    .then(results =&gt; {
        console.log(results);
    })
    .catch(error =&gt; {
        console.error(error);
    });

In this example, we have an array of promises returned by the `fetch` function, which makes a network request to retrieve data from different endpoints. We then call the `handlePromises` function with the `promisesArray` and handle the results or catch any errors as needed.

By using the await generator technique with ES7 features, you can efficiently work with arrays of promises, ensuring that you fetch and process data asynchronously in a clear and concise manner. So, go ahead and experiment with this powerful tool in your JavaScript projects to take your coding skills to the next level!

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