Bookmarklet to filter comments on Hacker News based on keywords

hacker-news-comment-filter

javascript: (function() {

    /* inject script */
    var v_jq = null;
    var v_element = document.createElement('script');
    v_element.src = '//code.jquery.com/jquery-latest.min.js';

    /* identify comments that do not meet the filter condition */
    var v_filter = function(v_comments, v_filters, v_is_whitelist) {
        v_discarded = v_comments.filter(function(v_comment) {
            var v_text = v_jq(v_comment).text().trim().toLowerCase();
            var v_contains_token = function(v_token) {
                return v_text.indexOf(v_token) > -1;
            };

            /* blacklist: if some elements match then discard the comment */
            var v_discard = v_filters.some(v_contains_token);

            /* whitelist: if some elements do not match then discard the comment */
            if (v_is_whitelist === true)
                v_discard = !v_discard;

            return v_discard;
        });

        return v_discarded;
    };

    /* hide each comment in the discard pile */
    var v_hide = function(v_discarded) {
        v_discarded.forEach(function(v_comment) {
            v_comment.closest('tr.athing.comtr').style.display="none";
        });
    };

    /* wait for jquery to load to begin processing */
    v_element.onload = function() {
        /* play nice with other instances of jquery */
        v_jq = jQuery.noConflict(true);

        /* start filtering comments */
        var v_comments = v_jq('.comment').toArray();
        var v_discarded = v_filter(v_comments, ['seattle'], true);
        v_hide(v_discarded);
    };

    document.head.appendChild(v_element);

})()