Sort an array relative to element position in another array using pure javascript [duplicate]

Question

Suppose I have two arrays:

arr1 = [64, 23, 35, 11, 55];
arr2 = [34, 10, 54, 12, 4];

If I rearrange (or sort) arr1 then the elements of arr2 should also be rearranged as per the position (or index) of arr1.

For example: if I sort arr1

arr1 = [11, 23, 35, 55, 64];

then the elements in arr2 should be

arr2 : [12, 10, 54, 4, 34 ]  (arranged according to index of arr1).

Is it possible? I found that it can be done in same array but I am trying with two different arrays. Thank you for helping.

Welcome to Stack Overflow! Please take the tour and read through the help center, in particular How do I ask a good question? You'll need to record the positions before sorting arr1. You'll also need to think about what to do with duplicates. Do your research, search for related topics on SO, and give it a go. If you get stuck and can't get unstuck after doing more research and searching, post a minimal reproducible example of your attempt and say specifically where you're stuck. People will be glad to help. Good luck! — T.J. Crowder
– T.J. Crowder, Commented May 16, 2018 at 11:39
If the arrays need to parallel each other, they shouldn't be separate arrays. They should be a single array of objects. — T.J. Crowder
– T.J. Crowder, Commented May 16, 2018 at 11:41
Even though I think better data structures should prevent you having this problem in the first place I added an answer to the duplicate with the simplest option. — HMR
– HMR, Commented May 16, 2018 at 11:56

Jonas Wilms · Accepted Answer · 2018-05-16 11:40:39Z

1

You could store the original positions before sorting of the first array, then apply that to the second:

 // Wrap original positions and values:
 const withPos = arr1.map((v, i) => ({v, i}));
 // Sort
 withPos.sort((a, b) => a.v - b.v);
 // Unwrap & apply sort to second array:
 arr1 = withPos.map(e => e.v);
 arr2 = withPos.map(e => arr2[e.i]);

answered May 16, 2018 at 11:40

Jonas Wilms

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2 Comments

Jonas Wilms Over a year ago

Try it!

Anil Poudel Over a year ago

Thank you, I had been puzzled for a whole day thinking for it.

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