getQueryParameter method
Gets the value of a specific query parameter.
Args:
key: The query parameter key.
Returns: The parameter value, or null if not found.
Example:
Uri.parse('https://example.com?page=1').getQueryParameter('page'); // '1'
Uri.parse('https://example.com').getQueryParameter('page'); // null
Implementation
String? getQueryParameter(String key) => queryParameters[key];