Enhance your JavaScript code by replacing Promise syntax with Async syntax and utilizing map() instead of a traditional For

I have a code snippet here that is functioning properly. However, I am interested in converting the Promise code in the middle of the function to Async code and replacing the for loop with map(). Can someone guide me on how to achieve this transformation?

const main = async () => {
    try{
        const driver = await new webdriver.Builder()
            .withCapabilities(webdriver.Capabilities.chrome())
            .setLoggingPrefs(prefs)
            .forBrowser('chrome')
            .setChromeOptions(options)
            .build();

        // Start promise code
        await driver.findElements(By.css('input'))
        .then(async (elements) => {
            elements.map(async (element) => {
                const val = await element.getAttribute("value");
                console.log(val);
            });
        })
        .catch((error) => {
            console.log(error);
        });
        // End promise code

        await driver.quit();
    } catch (error) {
        console.log(error);
    }
};

main();

Answer №1

When outputting information to the console, consider following this approach:

// Starting promise code
try {
  for (let element of await driver.findElements(By.css('input'))){
    console.log(await element.getAttribute("value"));
  }
} catch (error) {
  console.log(error);
}

This demonstrates how utilizing async/await can simplify imperative programming, incorporating let in loops.

A notable distinction from your original code is that it retrieves attributes sequentially (whereas yours depended on the timing of getAttribute).

If efficiency is a priority, you can extract attributes concurrently while maintaining order by employing this method:

let elements = await driver.findElements(By.css('input'));
for (let val of await Promise.all(elements.map(e => e.getAttribute("value")))) {
  console.log(val);
}

Answer №2

It seems like you're looking to swap out some of that promise code for functionally similar code in a different style? If that's the case, here's that code condensed into just two lines:

// Start promise code
const elements = await driver.findElements(By.css('input'));
await Promise.all(elements.map(ele => ele.getAttribute('value').then(console.log))).catch(console.log);
// End promise code

You mentioned wanting to replace the promise-based code with async/await style code. While it may be beneficial in this scenario, I would generally advise against it as async/await is essentially built on promises (you can't escape them). Embrace the promise and utilize async/await only when it truly enhances readability.

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