var searchTerm = 'cats';

$.ajax(
    "https://www.reddit.com/subreddits/search.json",
    {
        data: { q: searchTerm },
        success: function(responseData) {
            if (responseData.data.children.length > 0) {
                console.log('# of results: ' + responseData.data.children.length);
                $.each(responseData.data.children, function(idx, searchResult) {
                    console.log("--- Title of Subreddit: " + searchResult.data.title);
                });
            } else {
                console.log("No subreddits match the search query!");
            }
        },
        error: function() {
            alert("Something didn't work!");
        }
    }
);