How Can I Achieve True Pseudo-Randomness with the Go Rand Package?

Understanding the Go Rand Package for True Pseudo-Randomness

The Go rand package provides functions for generating pseudo-random numbers. By default, these numbers are based on a specific seed value, leading to predictable results with each run. This can be problematic when generating true pseudo-random numbers for applications that require unpredictable outcomes.

Achieving True Pseudo-Randomness

To address this issue, you need to initialize the random generator with a unique seed value that varies with each run. A common practice is to use the current time in nanoseconds:

<code class="go">import "time"

func main() {
    rand.Seed(time.Now().UnixNano())
    fmt.Println(rand.Int31n(100))
}</code>

This approach leverages the fact that the current time is constantly changing. As a result, the random numbers generated will differ with each execution.

Alternative for Enhanced Security

For applications where security is paramount, such as pass-phrase generators, consider using the crypto/rand package instead of the rand package. The functions in crypto/rand rely on more advanced techniques to generate stronger random numbers. However, note that these functions may be significantly slower.

Key Takeaway

By setting a unique seed value, you can ensure that the Go rand package generates true pseudo-random numbers. The rand package is suitable for most applications, but crypto/rand offers enhanced security at a potential performance cost.

The above is the detailed content of How Can I Achieve True Pseudo-Randomness with the Go Rand Package?. For more information, please follow other related articles on the PHP Chinese website!