patatap.com random keys

patatap.random.keys.js

/*
    visit http://www.patatap.com/ then run this code in your
    console. change the bpm and maxNotes variables
*/
(function (global) {
    var bpm = 80,
        maxNotes = 5,
        interval = (60 * 1000) / bpm,
        between = function (min, max) {
            return Math.floor(Math.random() * (max - min + 1) + min);
        };

    // clear any previously set intervals (idempotence)
    clearInterval(global.NOTE_INTERVAL);

    // hit some random keys on an interval
    global.NOTE_INTERVAL = setInterval(function () {
        var i, key, notes = between(0, maxNotes);
        console.clear();
        console.log('playing:');
        for (i = 0; i < notes; i++) {
            key = between(65, 90);
            console.log(key, ':', String.fromCharCode(key));
            jQuery.event.trigger({
                type: 'keydown',
                which: key
            });
        }
    }, interval);
}(window));