What is the difference between using the GCD (Greatest Common Divisor) function and asynchronous programming methods with async/await?

The GCD (Greatest Common Divisor) calculation function is a synchronous operation that performs a mathematical algorithm and returns the result immediately after computation.

Asynchronous programming with async/await is a way of organizing code that allows performing operations that may take time (such as network requests, file reading) without blocking the main execution thread. async/await simplifies working with promises, making asynchronous code look like synchronous.

Main difference:

• GCD is a specific computational function, usually synchronous.
• async/await is a tool for managing asynchrony in code, not tied to specific algorithms.

Example of async/await in Swift:

func fetchData() async throws -> Data {
    let url = URL(string: "https://example.com/data.json")!
    let (data, _) = try await URLSession.shared.data(from: url)
    return data
}

Here, async/await helps wait for the network request result without blocking the UI.