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How to sort array of objects by single key with date value with JavaScript?

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To sort array of objects by single key with date value with JavaScript, we can subtract the timestamps.

For instance, we write

const arr = [
  {
    updatedAt: "2022-01-01T06:25:24Z",
    foo: "bar",
  },
  {
    updatedAt: "2022-01-09T11:25:13Z",
    foo: "bar",
  },
  {
    updatedAt: "2022-01-05T04:13:24Z",
    foo: "bar",
  },
];
const sorted = arr.sort(
  (a, b) => +new Date(a.updatedAt) - +new Date(b.updatedAt)
);

to call arr.sort with a callback that converts updateAt to dates with the Date constructor.

And then we convert them to timestamps in milliseconds with +.

Finally, we subtract them to compare them.

A new array with the sorted values is returned.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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