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Say you have an array of objects like this, which contains a set of date objects:

const activities = [
  { title: 'Hiking', date: new Date('2019-06-28') },
  { title: 'Shopping', date: new Date('2019-06-10') },
  { title: 'Trekking', date: new Date('2019-06-22') }
]

You want to sort those activities by the date property.

You can use the sort() method of Array, which takes a callback function, which takes as parameters 2 objects contained in the array (which we call a and b):

const sortedActivities = activities.sort((a, b) => {
  return new Date(b.date) - new Date(a.date)
})

When we return a positive value, the function communicates to sort() that the object b takes precedence in sorting over the object a. Returning a negative value will do the opposite.


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