Node.js stdout and clear prev. line

stdout.js

var out = {
    prev: '',
    log: function (message) {
        process.stdout((new Array(this.prev.length + 1)).join(' ') + " \r");
        process.stdout(message + "\r");
        this.prev = message;
    }
};

Usage:
out.log('First very very very very long message');
out.log('Short message');