URLSearchParamsMap.set("topic","vega")// will overwrite current 'topic' ('d3')
URLSearchParamsMap.getAll("topic")
URLSearchParamsMap.get("jules")
URLSearchParamsMap.toString()
## Iterator
`URLSearchParams` supports the [iteratable protocol](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterable_protocol) so it directly be used in a `for of` loop.
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