Sort a list by the second number after a dot

Question

I need to sort a list by the second batch number with JavaScript.

This is how it looks like now:

1101.19
1201.17
1301.09

What I need is:

1301.09
1201.17
1101.19

As I am still learning to program I can't figure out the issue. But need it at work.

Can someone help me understand the process of how to do it?

Would you use the `reverse` method on an array? Like this: `[1101.19, 1201.17, 1301.09].sort().reverse().join('\n')` — auroranil, Mar 16 '20 at 08:31
Do all numbers come in the same format or can you have a whole number mixed? Do they come as strings or number objects. Have you tried using `sort` - if so, what stopped you? — Adrian, Mar 16 '20 at 08:41
What's the meaning of the part after the dot? Should it be interpreted as an integer or a floating point value? — Ja͢ck, Mar 16 '20 at 12:03
The part after the dot is the year of production, so an integer. — Codebelle, Mar 16 '20 at 12:38
Thanks, for all your answers and questions, unfortunately my workplace is not yet set up to work properly, and I'll have to wait until tomorrow to test anything.. — Codebelle, Mar 16 '20 at 12:39
Tomorrow has come, have you had a chance to look at this again? — Ja͢ck, Mar 18 '20 at 01:15
Sorry for the late answer. We figured that we can find a much simpler solution through dataTables, and sort by createdDate in the backgound — Codebelle, Mar 23 '20 at 00:42
@Codebelle you could still check the solutions given here and could approve the best suit answer which could be implemented in the clien side. — Nitheesh, Jun 10 '20 at 11:43

Nitheesh · Answer 1 · 2020-03-16T10:26:43.293

1

Sort the array depending on the decimal part. Here is the solution

Sort the array by selecting the decimal part of the number inside the sort function.

You can get the decimal part of any number by taking modulus operation with 0.1. Link.

const arr = [1101.19, 1201.17, 1301.09, 1201.20];
arr.sort((a, b) => {return (a % 1 - b % 1)});
console.log(arr);

edited Mar 16 '20 at 10:26

answered Mar 16 '20 at 08:44

Nitheesh

19,238
3
22
49

Number or string? – Nitheesh Mar 16 '20 at 08:47
@Adriani6 oops there was was small error inside sort function. Corrected that. Please check – Nitheesh Mar 16 '20 at 09:00
`.sort` mutates the original array, so no need of arr2 or sort a copy of array `[...arr].sort((a, b) => a % 1 - b % 1))` – AZ_ Mar 16 '20 at 10:21

score 0 · Answer 2 · answered Mar 16 '20 at 08:47

You need to split each element before sort and compare second parts

let array = ["1101.69", "1701.57", "1301.09"];
array.sort((a,b)=>{
  let pair1 = a.split('.');
  let pair2 = b.split('.');
  return ( parseInt(pair1[1]) < parseInt(pair2[1])) ? -1 : 1;
});
console.log(array);

Sort a list by the second number after a dot

2 Answers2