A bare-bones helper for creating simple demos/tutorials. See example usage here: http://www.jsvine.com/gmap-button/demo/

exemplify.js

var exemplify = function (fn, code_el) {
    fn.call(fn);
    var str = fn.toString();
    var lines = str.split("\n").slice(1, -1);
    var start_index = lines[0].match(/[^\s].*$/).index;
    var trimmed = lines.map(function (x) {
        return x.slice(start_index);
    }).join("\n");
    code_el.innerHTML = trimmed;
};