The following works for creating a 9 digit Canadian Social Insurance Number:
runScript|{var validPrefix = new Array(1, 2, 3, 4, 5, 6, 7, 9); var length = 9; var sin = new Array(length); sin[0] = validPrefix[Math.floor(Math.random() * validPrefix.length)]; var index = 1; while (index < length - 1) {sin[index] = Math.floor(Math.random() * 9); index++; } var sum = 0; var pos = 1; while (pos < length - 1) { var odd = sin[pos] * 2; sum += odd > 9 ? odd - 9 : odd; sum += sin[pos - 1]; pos += 2; } var checkdigit = ((Math.floor(sum / 10) + 1) * 10 - sum) % 10; sin[length - 1] = checkdigit; var MySin = (sin.join("")); return MySin;}|mySin
