Add or update url query parameter in javascript

adding or updating url query parameters in javascript involves manipulating the url of the current page. this can be achieved using the `url` and `urlsearchparams` interfaces, which provide a convenient way to work with the query string. to add a new parameter, you create an instance of `url` with the current page's url and then utilize the `urlsearchparams` object to append the desired key-value pair. if the parameter already exists, you can update its value by setting it with the same key. after modifications, the updated query string can be reflected back in the url using the `href` property. this method not only updates the url in a user-friendly way but also ensures that the page can be reloaded with the new parameters intact. additionally, these changes can be made without reloading the page, contributing to a smoother user experience, especially in single-page applications.
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