Sorting an array of objects based on the index after mapping through an array

Question

I am fetching an array of objects from the server and I use "map" to render the array elements as following :

data.map((item, index) => {
     <div>{item.index + 1}</div>
     <div>{item.name}</div>
     <div>{item.price}</div>
})

and I get a list of items starting from index 1 in ascending order. What I want to do is, I want to rearrange the array in a descending order instead. I want the first element rendered with the latest index that indicates the last element of the array. Is there a way to achieve this in javascript and ReactJs. Thanks in advance.

Could you post an example of the output you want versus the output you have now? — Titulum
– Titulum, Commented Aug 13, 2020 at 10:52

Titulum · Accepted Answer · 2020-08-13 10:50:13Z

1

You can easily do this by issueing the reverse method:

data.reverse().map((item, index) => {
     <div>{item.index + 1}</div>
     <div>{item.name}</div>
     <div>{item.price}</div>
})

Do keep in mind that this also changes the original array. So the reverse method will not only return a reversed array of data, but also mutate the data array itself.

edited Aug 13, 2020 at 10:50

answered Aug 13, 2020 at 10:49

Titulum

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3 Comments

Nikita Madeev Over a year ago

I want the first element rendered with the latest index that indicates the last element of the array

Titulum Over a year ago

Hmmm maybe I am misunderstanding the question. I will ask the OP to post an example of the output he wants.

Saif Over a year ago

That worked perfectly as expected. I just fixed the index to start from the length of the array. Thanks a lot for help.

Shadab · Accepted Answer · 2020-08-13 10:51:19Z

0

Something like this?

data.map((item, index) => {
     <div>{data.length - item.index}</div>
     <div>{item.name}</div>
     <div>{item.price}</div>
})

is the item.index intentional here? or did you mean just index?

answered Aug 13, 2020 at 10:51

Shadab

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Comments

Omkar Kulkarni · Accepted Answer · 2020-08-13 10:58:03Z

0

What I have understood is that you want to sort this in descending order of 'index' that is present as a key in every object. If that is the case, this will work.

data
  .sort((a,b)=>{return b.index-a.index}) // sorting it in descending order
  .map((item, index) => {
     <div>{item.index + 1}</div>
     <div>{item.name}</div>
     <div>{item.price}</div>
})

answered Aug 13, 2020 at 10:58

Omkar Kulkarni

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