12. Go - RNG

 import "math/rand"

rand.Seed(time.Now().UnixNano())

variable := rand.intn(50)

// RNG from 0 to 50

rand.Float64()

// RNG from 0 to 1.0

rand.Intn(max-min) + min

// RNG from min to max

rand.Perm(100)

// RNG shuffled array from 0 to 100