grokify/mogo

package randutil

import "github.com/grokify/mogo/encoding/basex"

// RandString returns a random string of length `length` using the supplied alphabet.
// If no alphabet is provided, `AlphabetBase16`, aha hexadecimal is used.
func RandString(alphabet string, length uint) string {
    if length == 0 {
        return ""
    }
    if len(alphabet) == 0 {
        alphabet = basex.AlphabetBase16
    }
    var out string
    for i := 0; i < int(length); i++ {
        idx := Intn(uint(len(alphabet)))
        if idx >= len(alphabet) {
            panic("idx too large")
        }
        out += string(alphabet[idx])
    }
    return out
}