在Go lang中生成固定长度的随机数

Question

I need to generate an unique random number in Golang. I have a simple ruby code for it:

(0...16).map { rand(10).to_s }.join

So, effectively i need to generate a number of length 16 where each digit is randomly picked up from [0-9]. I did not understand how random.Intn(n) function can help me. Any idea how can I do this?

Answer 1

One way is:

s := ""
for i := 0; i < 16; i++ {
    s += (string)(rand.Intn(10) + 48)
}

48 is the ascii value for 0.

Or by using @Flimzy's more efficient suggestion:

s := fmt.Sprintf("%016d", rand.Int63n(1e16))

where "%016d" will help pad the number with zeros.