Miks anti/oot konstruktsioon võeti kasutusele ja kuidas see parandab töö asünkroonse koodiga?

Async/await was introduced to simplify writing asynchronous code, making it more readable and maintainable compared to traditional callbacks or promises.

How it improves:

1. Readability: Code with async/await looks like synchronous, line-by-line code, which greatly simplifies understanding.
2. Error handling: Allows using standard try/catch constructs to handle errors in asynchronous code, unlike .catch() promises.
3. Debugging: Breakpoints work the same way as in synchronous code, simplifying the debugging process.
4. Less "callback hell": Eliminates the nested callback problem, which leads to unreadable code.

Example:

Code with promises:

// Example with promises
fetch('https://api.example.com/data')
  .then(response => response.json())
  .then(data => {
    console.log(data);
  })
  .catch(error => {
    console.error('Error fetching data:', error);
  });

The same code with async/await:

// Example with async/await
async function fetchData() {
  try {
    const response = await fetch('https://api.example.com/data');
    const data = await response.json();
    console.log(data);
  } catch (error) {
    console.error('Error fetching data:', error);
  }
}

fetchData();

The async/await construct is built on top of promises and is syntactic sugar for working with them. A function marked as async always returns a promise. The await operator can only be used inside an async function and it "waits" for the promise to resolve, returning its resolved value or throwing an error in case of failure.