Sort array of objects by single key with date value

var arr = [{

    "updated_at": "2012-01-01T06:25:24Z",

    "foo": "bar"

  },

  {

    "updated_at": "2012-01-09T11:25:13Z",

    "foo": "bar"

  },

  {

    "updated_at": "2012-01-05T04:13:24Z",

    "foo": "bar"

  }

]



arr.sort(function(a, b) {

  var keyA = new Date(a.updated_at),

    keyB = new Date(b.updated_at);

  // Compare the 2 dates

  if (keyA < keyB) return -1;

  if (keyA > keyB) return 1;

  return 0;

});



console.log(arr);

foo.sort((a, b) => a.updated_at < b.updated_at ? -1 : 1)