What tasks have you used goroutines and channels for?

Goroutines and channels in Go are used for solving tasks related to parallelism and data synchronization.

Examples of tasks:

• Parallel data processing: launching multiple goroutines to process parts of a large array or perform network requests simultaneously, which speeds up execution.

• Thread-safe interaction: channels are used to transfer data between goroutines without using mutexes, simplifying the code and reducing the likelihood of errors.

• Implementation of worker pool: creating a pool of workers (goroutines) that receive tasks through a channel, process them, and send results back.

• Synchronization and coordination: channels are used for signaling task completion, error transmission, or managing execution order.

Example of using a channel to collect results from multiple goroutines:

results := make(chan int)

for i := 0; i < 5; i++ {
    go func(val int) {
        // some work
        results <- val * 2
    }(i)
}

for i := 0; i < 5; i++ {
    fmt.Println(<-results)
}

Thus, goroutines and channels allow for efficient organization of concurrent execution and data exchange in Go.