Sha256: 1788f85c7ea08a739f5fb816e83c33c8121689aeb144ebeebb663134588280c4
Contents?: true
Size: 484 Bytes
Versions: 161
Compression:
Stored size: 484 Bytes
Contents
package luhn
import "strings"
const testVersion = 2
func Valid(id string) bool {
if len(strings.TrimSpace(id)) == 1 {
return false
}
d := make([]int, 0, len(id))
for _, r := range id {
if r == ' ' {
continue
}
if r < '0' || r > '9' {
return false
}
d = append(d, int(r-'0'))
}
return sum(d)%10 == 0
}
func sum(d []int) (s int) {
for i, x := range d {
j := len(d) - i
if j%2 == 0 {
x *= 2
if x > 9 {
x -= 9
}
}
s += x
}
return
}
Version data entries
161 entries across 161 versions & 1 rubygems