How to sort array of objects by 2 property values – JavaScript

Here's how to order an array of objects by multiple property values.

I want to order my friends:

• First the oldest.
• If they have the same age, first the tallest.

We'll use Array.prototype.sort()

const friends = [
	{ name: 'Friend 1', age: 30, height: 1.8 },
	{ name: 'Friend 2', age: 17, height: 1.85 },
	{ name: 'Friend 3', age: 18, height: 1.75 },
	{ name: 'Friend 4', age: 25, height: 2 },
	{ name: 'Friend 5', age: 25, height: 1.8 }
]Code language: JavaScript (javascript)

friends.sort((a, b) => {
    let n = b.age - a.age;
    if (n !== 0) return n;

    return b.height - a.height;
});Code language: JavaScript (javascript)

Result

As you can see the friend 4 and 5, who have the same age have been sorted by tallest first.

[[object Object] {
  age: 30,
  height: 1.8,
  name: "Friend 1"
}, [object Object] {
  age: 25,
  height: 2,
  name: "Friend 4"
}, [object Object] {
  age: 25,
  height: 1.8,
  name: "Friend 5"
}, [object Object] {
  age: 18,
  height: 1.75,
  name: "Friend 3"
}, [object Object] {
  age: 17,
  height: 1.85,
  name: "Friend 2"
}]Code language: CSS (css)