tcno.swift

func validateID(_ id: String) -> Bool {
	let digits = id.map {Int(String($0))} as! [Int]
	guard digits.count == 11, digits[0] != 0, digits[9] != 0 else { return false }
	let firstValidation = (digits[0] + digits[2] + digits[4] + digits[6] + digits[8]) * 7
	let secondValidation = digits[1] + digits[3] + digits[5] + digits[7]
	
	let tenthDigit = (firstValidation - secondValidation) % 10
	let eleventhDigit = (digits.reduce(0, +) - digits[10]) % 10
	return (digits[9] == tenthDigit && digits[10] == eleventhDigit)
}

//usage
validateID("49673861228") //returns true and generated from https://www.simlict.com/