minDate

Returns the minimum of the given dates.

• Use the ES6 spread syntax with Math.min() to find the minimum date value.
• Use new Date() to convert it to a Date object.

const minDate = (...dates) => new Date(Math.min(...dates));

const dates = [
  new Date(2017, 4, 13),
  new Date(2018, 2, 12),
  new Date(2016, 0, 10),
  new Date(2016, 0, 9)
];
minDate(...dates); // 2016-01-08T22:00:00.000Z