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Asynchronous generators and iteration are features of Javascript that allow for more flexible and efficient handling of asynchronous data streams.

An asynchronous generator is a function that returns an iterator object, which can be used to iterate over a sequence of values that are produced asynchronously. The function is declared using the async function* syntax and contains one or more yield statements that produce the next value in the sequence. Each time a value is produced, it is returned to the calling code as a promise, which can be resolved asynchronously.

Here is an example of an asynchronous generator that produces a sequence of random numbers:

async function* generateRandomNumbers() {
  while (true) {
    yield new Promise(resolve => setTimeout(() => {
      resolve(Math.random());
    }, 1000));
  }
}

This generator produces a new random number every second using the setTimeout function, which returns a promise that resolves after a specified time interval.

To iterate over the sequence of values produced by the generator, you can use a for await...of loop. This loop allows you to asynchronously iterate over the sequence of values produced by the generator, waiting for each value to be produced before moving on to the next one.

Here is an example of how to use the for await...of loop to iterate over the sequence of random numbers produced by the generator:

(async () => {
  for await (const value of generateRandomNumbers()) {
    console.log(value);
  }
})();

In this example, the for await...of loop is used to iterate over the sequence of random numbers produced by the generateRandomNumbers generator. Each time a new number is produced, it is logged to the console.

In summary, asynchronous generators and iteration are powerful features of Javascript that allow for more flexible and efficient handling of asynchronous data streams. They enable the production of asynchronous data streams that can be iterated over using the for await...of loop, making it easier to work with large amounts of data that is produced asynchronously.

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Copyright © 2023. All rights reserved.