compare string version in Swift

version.swift

struct Version {
    let rawValue: String

    init(_ string: String) {
        self.rawValue = string
    }

    enum CompareResult {
        case greaterThan
        case equal
        case lessThan
    }

    func compareWithVersion(version: Version) -> CompareResult {
        var v1 = rawValue.split(separator: ".").map { Int($0) ?? 0 }
        var v2 = version.rawValue.split(separator: ".").map { Int($0) ?? 0 }
        for i in 0..<max(v1.count, v2.count) {
            let left = i >= v1.count ? 0 : v1[i]
            let right = i >= v2.count ? 0 : v2[i]

            if left > right {
                return .greaterThan
            } else if right > left {
                return .lessThan
            }
        }
        return .equal
    }

    static func ==(lhs: Version, rhs: Version) -> Bool {
        return lhs.compareWithVersion(version: rhs) == .equal
    }

    static func <(lhs: Version, rhs: Version) -> Bool {
        return lhs.compareWithVersion(version: rhs) == .lessThan
    }

    static func >(lhs: Version, rhs: Version) -> Bool {
        return lhs.compareWithVersion(version: rhs) == .greaterThan
    }

    static func >=(lhs: Version, rhs: Version) -> Bool {
        return lhs.compareWithVersion(version: rhs) == .greaterThan || lhs.compareWithVersion(version: rhs) == .equal
    }

    static func <=(lhs: Version, rhs: Version) -> Bool {
        return lhs.compareWithVersion(version: rhs) == .lessThan || lhs.compareWithVersion(version: rhs) == .equal
    }
}

Version("1.0") < Version("1.0.0")
Version("1.0") <= Version("1.0.0")
Version("1.1") > Version("1.2.0")
Version("1.2.1") > Version("1.2.1")