Created
April 26, 2017 00:23
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ABA Routing Number Validation in Swift3. Inspired by http://www.brainjar.com/js/validation/ and ported to Swift 3
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let routingNumber = "026009593" | |
func isRoutingValid(routingNumber: String) -> Bool { | |
let t = String(routingNumber.characters.filter { "1234567890".characters.contains($0) }) | |
let count = t.characters.count | |
guard count == 9 else { return false } | |
var n = 0 | |
// Run through each digit and calculate the total. | |
for i in stride(from: 0, to: count, by: 3) { | |
guard let a = Int(String(t[t.index(t.startIndex, offsetBy: i)])), | |
let b = Int(String(t[t.index(t.startIndex, offsetBy: i+1)])), | |
let c = Int(String(t[t.index(t.startIndex, offsetBy: i+2)])) else { return false } | |
n += (a * 3) + (b * 7) + c | |
} | |
//print(n) | |
// If the resulting sum is an even multiple of ten (but not zero), | |
// the aba routing number is good. | |
return n != 0 && n%10 == 0 | |
} | |
isRoutingValid(routingNumber: routingNumber) |
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