Dinir

/**
 * Get a query map based on a query string.
 *
 * The function will populate a map variable with key value pairs of the parameters.
 *
 * If there is more than one of the same key, the function will populate an array in the map with the multiple values within it.
 *
 * Forked from {@link https://gist.github.com/MatthewDaniels/388fa1e0c02613f103f00a504ed58c55 MatthewDaniels/parse-query-parameters-into-a-map.js}.
 *
 * @param  {?string} [query=window.location.search] The query string - the question mark is optional