B retrieves and returns random bytes of given length `n`.

D returns a random time.Duration between min and max: [min, max].

Digits returns a random string which contains only digits, and its length is `n`.

Intn returns an int number which is between 0 and max: [0, max).

Letters returns a random string which contains only letters, and its length is `n`.

Meet randomly calculate whether the given probability `num`/`total` is met.

MeetProb randomly calculate whether the given probability is met.

N returns a random int between min and max: [min, max].

Perm returns, as a slice of n int numbers, a pseudo-random permutation of the integers [0,n).

S returns a random string which contains digits and letters, and its length is `n`.

Str randomly picks and returns `n` count of chars from given string `s`.

Symbols returns a random string which contains only symbols, and its length is `n`.