Created
September 19, 2019 20:39
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Roman numeral parser: a swift one-liner
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| let numerals: [Character:Int] = ["I": 1, "V": 5, "X": 10, "L": 50, "C": 100, "D": 500, "M": 1000] | |
| func parse(romanNumeral numeral: String) -> Int { | |
| return numeral.compactMap { numerals[$0] }.reversed().reduce((0, 0)) { $0.1 <= $1 ? ($0.0 + $1, $1) : ($0.0 - $1, 0) }.0 | |
| } | |
| assert(parse(romanNumeral: "MMXIX") == 2019) |
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