lorenzo-gasperoni

/* Use max-height in the transformation and not height.
/* And set a value on max-height to something bigger than your box will ever get. */

#menu #list {
    max-height: 0;
    transition: max-height 0.15s ease-out;
    overflow: hidden;
    background: #d5d5d5;
}

lorenzo-gasperoni

// object
var object = {
  label1: 'value1',
  label2: 'value2'
};

// cycle object having access to labels and values
Object.keys(person).forEach(function(trait) {
  console.log('Person ', trait,': ', person[trait]);
});