How to Sort an Array of Objects by a Single Date Key?

Sorting an Array of Objects by a Single Date Key

To sort an array of objects by a single key that contains a date value, the most efficient approach is to utilize the Array.sort method. Here's how you can do it:

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);

In this example, we have an array of objects named "arr" containing three objects, each with an "updated_at" key holding a date value.

The Array.sort method takes a compare function as an argument. In the compare function provided:

1. We extract the "updated_at" values from each object as Date objects.
2. We compare the two Date objects. If the first is earlier than the second, we return -1. If it's later, we return 1. If they are equal, we return 0.
3. This compare function sorts the array in ascending order based on the "updated_at" values.

The sorted array is then logged to the console, displaying the objects in chronological order.

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