Bookmarklet to color-rank 8tracks search results

8tracks.js

function parse(str){
    return parseInt(str.replace(/,/g, ""));
};

function cap(num, min, max) {
    return Math.max(min, Math.min(num, max));
};

$(".card").each(function(){
    var plays = $(this).find(".plays_count").text();
    var likes = $(this).find(".likes_count").text();
    var ratio = parse(likes) * 10.0 / parse(plays);
    var value = cap(1.3 - ratio, 0, 1);
    var color = Math.floor(255 * value);
    var chars = "rgb(255," + color + "," + color + ")";

    $(this).find(".reason").css("background-color", chars);
});