在Golang中生成固定长度的随机十六进制字符串的有效方法？(Efficient way to to generate a random Hex string of a fixed length in Golang?)

Actually the code you posted runs, as even though there's a mistake in it (see below), it still doesn't cause a panic (just makes performance worse).

math/randgo versiongo env

Reason for panic / Solution:

RandStringBytesMaskImprSrc()RandStringBytesMaskImprSrc()rand.Sourcemath/randrand.Source()RandStringBytesMaskImprSrc()

There is a mistake in the "configuration" constants at the beginning:

const letterBytes = "abcdef0123456789"
const (
    letterIdxBits = 6                    // 6 bits to represent a letter index
    letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
    letterIdxMax  = 63 / letterIdxBits   // # of letter indices fitting in 63 bits
)

letterIdxBitsletterBytes

letterIdxBits = 4                    // 4 bits to represent a letter index

Example testing it:

var tryArr = make([]string, 10)
for i := range tryArr {
    tryArr[i] = RandStringBytesMaskImprSrc(8)
}
fmt.Println(tryArr)

Output (try it on the Go Playground):

[d3e7caa6 a69c9b7d c37a613b 92d5a43b 64059c4a 4f08141b 70130c65 1546daaf fe140fcd 0d714e4d]

(Note: since the starting time on the Go playground is fixed and output is cached, you will always see these random generated strings. Run it on your machine to see random results.)