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URLのクエリパラメータをDictionaryで得る

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URLクラスに最初からあっても良さげですが、無いのでextensionで追加しました。

public extension URL {
    public func queryParams() -> [String : String] {
        var params = [String : String]()

        guard let comps = URLComponents(string: self.absoluteString) else {
            return params 
        }
        guard let queryItems = comps.queryItems else { return params }

        for queryItem in queryItems {
            params[queryItem.name] = queryItem.value
        }
        return params
    }
}
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