Get Specific URLQueryItem from URLComponents

Consider the following URL:

http://www.example.com/?utm_source=adsite&utm_campaign=adcampaign&utm_term=adkeyword

We are interested in the query parameter value of utm_term. We can parse the URL using the following code:

// https://hashaam.com/2017/09/02/get-specific-urlqueryitem-from-urlcomponents
func queryParam(urlString: String?, param: String) -> String? {
guard let urlString = urlString else { return nil }
guard let urlComponents = URLComponents(string: urlString) else { return nil }
guard let queryItems = urlComponents.queryItems else { return nil }
return queryItems.filter { queryItem in
return queryItem.name == param
}.first?.value
}

And call the function using:

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