fastrand

func Perm ¶

func Perm(n uint32) []uint32

Perm returns a random permutation of the range [0,n).

func Probability ¶

func Probability(prob uint32) bool

Probability 小于prob的概率, prob is in the range [0,1000)

func Random ¶

func Random(ss []string) []string

Random return random string from string slice

func Read ¶

func Read(b []byte)

Read is a helper function that calls rr.Read on b. It always fills b completely.

func Sampling ¶

func Sampling(rate float32) bool

Sampling 采样率, [rate] is in the range [0,1)

func Shuffle ¶

func Shuffle(n int, swap func(i, j int))

Shuffle pseudo-randomizes the order of elements.

n: is the number of elements. Shuffle panics if n < 0.
swap: swaps the elements with indexes i and j.

func Uint32 ¶

func Uint32() uint32

Uint32 returns pseudorandom uint32. It is safe calling this function from concurrent goroutines.

func Uint32n ¶

func Uint32n(maxN uint32) uint32

Uint32n returns pseudorandom uint32 in the range [0...maxN). It is safe calling this function from concurrent goroutines.