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random_shuffle takes a list of strings and returns a new list with the same items in a random permutation. Optionally allows the result list to be a different length than the input list. A shorter result than input results in some items being excluded. A longer result than input results in some items being repeated, but never more often than the number of input items.
25 lines
525 B
Go
25 lines
525 B
Go
package random
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import (
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"hash/crc64"
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"math/rand"
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"time"
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)
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// NewRand returns a seeded random number generator, using a seed derived
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// from the provided string.
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//
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// If the seed string is empty, the current time is used as a seed.
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func NewRand(seed string) *rand.Rand {
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var seedInt int64
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if seed != "" {
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crcTable := crc64.MakeTable(crc64.ISO)
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seedInt = int64(crc64.Checksum([]byte(seed), crcTable))
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} else {
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seedInt = time.Now().Unix()
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}
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randSource := rand.NewSource(seedInt)
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return rand.New(randSource)
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}
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