CODEWITHSUNDEEP
javascriptarrays
Helmi
Helmi

Reputation: 539

Get latest object with oldest date from array of objects with date object

Here's what my array looks like

[
 { name: "myname", date: dateObj, value: 2 },
 { name: "othername", date: dateObj, value: 3 },
 { name: "newname", date: dateObj, value: 5 },
]

Dates are native date objects.

What would be the smartest way to get the one object with the oldest date? Is there a better way than sorting the whole array by looping through?

Upvotes: 7

Views: 4883

Answers (3)

Robin Zigmond
Robin Zigmond

Reputation: 18249

This should do what you want, if we call your array myArray:

myArray.sort((objA, objB) => objA.date.getTime() - objB.date.getTime())[0];

Upvotes: 1

Ori Drori
Ori Drori

Reputation: 191946

You can use Array.reduce() to iterate the array, and on each iteration pick the object with the oldest date:

const data = [
 { name: "myname", date: new Date(2016, 5, 1), value: 2 },
 { name: "othername", date: new Date(2018, 6, 1), value: 3 },
 { name: "newname", date: new Date(2017, 12, 1), value: 5 },
];

const result = data.reduce((r, o) => o.date < r.date ? o : r);

console.log(result);

Upvotes: 15

Bhagwat Chouhan
Bhagwat Chouhan

Reputation: 85

Yes. The Array must be pre-sorted. :)

In other words, No. Without iterating the whole Array, there seems no way to find out the Object with oldest date. We need to iterate the Array.

Upvotes: 1

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