Question: build a query string

*

* Querying a web data API involves formatting a query string in a particular way.

* As we know from week 1, a query string is a set of name=value pairs, that starts

* with the ? character, and each pair is separated by the & character, see:

* https://web222.ca/weeks/week01/#query-strings

*

* For example:

*

* ?q=dog&sort=ascending includes q=dog and sort=ascending

* ?_encoding=UTF8&node=18521080011 includes both _encoding=UTF8 and also node=18521080011

*

* Write a buildQueryString() function to build a query string based on arguments

* passed by the caller.

*

* The buildQueryString() function accepts the following arguments:

*

* - queryTerm: a search string, for example "butterfly" or "Horse-chestnut"

* - sortOrder: a string indicating sort order, with possible values of `ascending` or `descending`

* - count: a number from 10 to 200, indicating how many results to return per page

*

* Write an implementation of buildQueryString() that accepts arguments for all of the above

* parameters, validates and formats them (e.g., encode the query, count must be between 10

* and 200, etc), and returns a properly formatted query string.

*

* For example:

*

* buildQueryString('Monarch Butterfly', 'ascending', 25) would return the following query string:

*

* '?query_term=Monarch%20Butterfly&count=25

*

* NOTE: the default sort order is ascending, so it isn't included. However, if we were to

* specify 'descending', it would need to get added:

*

* buildQueryString('Monarch Butterfly', 'descending', 25) would return the following query string:

*

* '?query_term=Monarch%20Butterfly&count=25&descending

*

* NOTE: if any of the values passed to buildQueryString() are invalid, an Error should be thrown.

*

* NOTE: make sure you properly encode the query value, since query strings can't contain

* spaces or other special characters. HINT: use the encodeURIComponent() function

* to do this, see:

*

* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent

*

* @param {string} queryTerm the query to use.

* @param {string} sortOrder the sort order to use, must be one of `ascending` or `descending`

* @param {number} count the number of results per page, must be 10-200

* @returns {string} the properly formatted query string

******************************************************************************/

function buildQueryString(queryTerm, sortOrder, count) {

// Replace this comment with your code...

}