rand

• Documentation - https://pkg.go.dev/math/rand

  Function	Description
  rand.Seed(seed)	Sets the seed for random generator
  rand.Int()	Random non-negative integer
  rand.Intn(n)	Random integer in range [0, n)
  rand.Int31()	Random 31-bit integer
  rand.Int63()	Random 63-bit integer
  rand.Float32()	Random float32 in range [0.0, 1.0)
  rand.Float64()	Random float64 in range [0.0, 1.0)
  rand.Perm(n)	Random permutation of [0..n-1]
  rand.Shuffle(n, swapFn)	Randomly shuffles elements
  rand.New(source)	Creates a new random generator
  rand.NewSource(seed)	Creates a new seed source

rand.Int() // Any Int number
rand.Intn(10) // Any Int number between 0 and 10(exclusive)
rand.Float64() // any float64 number
  
rand.Perm(5) // slice of n elements with range [0, n)
  
nums := []int{1,2,3,4,5}  // Shuffle the existing list
rand.Shuffle(len(nums), func(i, j int) {  
  nums[i], nums[j] = nums[j], nums[i]  
})  
nums