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Shuffle a slice or array
source link: https://yourbasic.org/golang/shuffle-slice-array/
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Shuffle a slice or array
yourbasic.org/golang
The rand.Shuffle function
in package math/rand
shuffles an input sequence using a given swap function.
a := []int{1, 2, 3, 4, 5, 6, 7, 8}
rand.Seed(time.Now().UnixNano())
rand.Shuffle(len(a), func(i, j int) { a[i], a[j] = a[j], a[i] })[5 8 6 4 3 7 2 1]Warning: Without the call to
rand.Seedyou will get the same sequence of pseudorandom numbers each time you run the program.
Further reading
Generate random numbers, characters and slice elements
Before Go 1.10
Use the rand.Seed and
rand.Intn functions in package
math/rand.
a := []int{1, 2, 3, 4, 5, 6, 7, 8}
rand.Seed(time.Now().UnixNano())
for i := len(a) - 1; i > 0; i-- { // Fisher–Yates shuffle
j := rand.Intn(i + 1)
a[i], a[j] = a[j], a[i]
}Share:
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