Is it beneficial to mix async/await and .then() in JavaScript?

Mixing Async/Await and .then() in JavaScript

Question:

Is it advisable to use both async/await and .then().catch() in the same asynchronous function, as seen below?

async apiCall(params) {
    var results = await this.anotherCall()
      .then(results => {
        //do any results transformations
        return results;
      })
      .catch(error => {
        //handle any errors here
      });
    return results;
  }

Answer:

Using async/await and .catch() together can provide concise and efficient error handling in JavaScript. Here's why:

Compact Code:

Async/await allows for a sequential, synchronous-like syntax in asynchronous code, while .catch() handles error handling. By combining the two, you can achieve clean and cohesive error management without needing try/catch blocks.

Example:

Consider the following example:

<code class="js">async function asyncTask() {
  throw new Error('network')
}

async function main() {
  const result = await asyncTask().catch(error => console.error(error));
  console.log('result:', result)
}

main();</code>

In this code, the asyncTask function throws a network error, which is gracefully handled by the .catch() block. The error is printed to the console, and the code continues to execute without affecting the main function.

Benefits:

Using async/await and .catch() together offers several advantages:

• Improved readability: The code is easier to understand, as the async/await syntax mimics synchronous programming.
• Simplified error handling: Error handling is centralized in the .catch() block, providing a consistent approach throughout the codebase.
• Increased efficiency: Async/await and .catch() streamline error handling by eliminating the need for try/catch blocks, reducing the amount of boilerplate code.

However, it's important to note that mixing async/await and .then() unnecessarily can introduce unnecessary complexity and potential callback hell. Therefore, it's generally recommended to use async/await and .catch() only when necessary.

The above is the detailed content of Is it beneficial to mix async/await and .then() in JavaScript?. For more information, please follow other related articles on the PHP Chinese website!