by Sai gowtham

How to sort the array of objects by key in JavaScript

In this tutorial, we are going to learn about how to sort the array of objects by key in JavaScript with the help of exmaples.

JavaScript has an built-in sort() method which helps us to sort the array of the objects easily; we don’t need to write our own custom sort methods.

Consider, that we have an array of objects with name and price properties.

const vegetables =  [
    {name:"beans",price: 5},
    {name:"tomato",price: 3},
    {name:"pumpkin",price: 2},
    {name:"broccoli",price: 7},
]

Now, we need to sort the above vegetables array in ascending order by using its price property.

Here is an example:

const vegetables =  [

     {name:"beans",price: 5},
     {name:"tomato",price: 3},
     {name:"pumpkin",price: 2},
     {name:"broccoli",price: 7},
]


console.log(vegetables.sort((a,b) =>  a.price - b.price ))
output - >

[
  {name: "pumpkin", price: 2},
  {name: "tomato", price: 3},
  {name: "beans",  price: 5},
  {name: "broccoli", price: 7}
]

Array.sort() : The sort() method takes the callback function as its argument and returns the sorted array.

The return condition inside the callback function.

  • if our return condition is a - b then it sorts the array in ascending order.

  • if our return condition is b - a then it sorts the array in descending order.

Let’s sort our vegetables array in descending order.

console.log(vegetables.sort((a,b) =>  b.price-a.price ))
output- >

[
  {name: "broccoli",price: 7},
  {name: "beans",price: 5},
  {name: "tomato",price: 3},
  {name: "pumpkin",price: 2}
]

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