How to Generate Unique Random Numbers with Go's Rand Package?

Overcoming Predictable Pseudorandom Generation in Go's Rand Package

The rand package in Go provides a means to generate pseudorandom numbers, but by default, these numbers may repeat for the same program execution. This can be problematic when seeking truly random results.

Identifying the Issue:

Consider the following Go code:

Upon executing this code, you'll notice that the same random number is generated every time. This occurs because the rand package initializes its pseudorandom number generator with a constant seed, leading to predictable results.

Solution:

To ensure unique random numbers in every execution, you need to provide a different seed before generating the random numbers. A common approach is to use the current time as the seed:

By setting the seed to a constantly changing value like the current time, you obtain a unique pseudorandom number sequence for each program execution.

Alternative for Sensitive Applications:

For applications that require more secure random number generation, consider utilizing the crypto/rand package. It employs entropy sources like user mouse movements and system heat to generate more secure random values. However, this comes at a performance cost.

Conclusion:

By setting the seed to a dynamic value such as the current time, you can overcome the predictability of the rand package in Go and generate truly random numbers. This approach suits most applications, while highly secure scenarios should consider the crypto/rand package.

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