21 lines
393 B
Go
21 lines
393 B
Go
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package shuffle
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import "math/rand"
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func FastShuffle[T Numeric](ar []T, key []byte) []T {
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if len(key) < 4 {
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return ar
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}
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var seed int64
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seed = int64(key[0])
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seed += int64(key[1]) << 8
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seed += int64(key[2]) << 16
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seed += int64(key[3]) << 24
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r := rand.New(rand.NewSource(seed))
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r.Shuffle(len(ar), func(i, j int) {
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j = rand.Intn(i + 1)
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ar[i], ar[j] = ar[j], ar[i]
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})
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return ar
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}
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