How to start an operation at the beginning of a method, perform other actions, and then wait for the result of the first operation?

To start an operation at the beginning of a method, then perform other actions, and after that wait for the result of the first operation, you can use asynchronous programming with subsequent waiting for the result. For example, in languages that support async/await (JavaScript, C#, Python), it is done as follows:

async function example() {
  const promise = asyncOperation(); // start the operation

  // perform other actions without waiting for the result
  doOtherThings();

  // now wait for the result of the first operation
  const result = await promise;
  console.log(result);
}

Thus, the operation is started immediately, other actions are performed in parallel, and then we wait for its completion without blocking the execution thread at the beginning of the method.