JavaScript, How to sort array by two sub index

Question

am trying to sort xy coordinates on both sub index it once mean row column Asc order. i have sorted coordinates data via Y but when i sort that data again via X then i lost Y order , so any idea how to do it?

what i have done

example: my raw coordinates xy data

var cxray = [ [450,13],[455,12],[454,12],[451,12],[452,13],[453,12], [450,12],[453,13],[454,13],[450,13],[452,12],[455,13],];

my single index sorting function

 this.ray_isort = function(data,i){
    data.sort( function( a, b ,sindex=i){if ( parseFloat(a[sindex]) == parseFloat(b[sindex]) ) return 0;return parseFloat(a[sindex]) < parseFloat(b[sindex]) ? -1 : 1;});
    return data;
  };

Fiddle Link : JSFIDDLE

currently when i sort it with one index i get output

my goal is to get

array.sort((a,b)=> a[0]-b[0] || a[1] - b[1])

Rajesh Dixit
– Rajesh Dixit

2017-07-14 11:28:37 +00:00
Commented Jul 14, 2017 at 11:28 — Rajesh Dixit
– Rajesh Dixit, Commented Jul 14, 2017 at 11:28

Erazihel · Accepted Answer · 2017-07-14 11:30:44Z

3

a[1] - b[1] will sort the array using the second items of each array.

If they're equal, the result will be 0 and thus the a[0] - b[0] part will be executed and will sort the array using the first items.

const cxray = [ [450,13],[455,12],[454,12],[451,12],[452,13],[453,12], [450,12],[453,13],[454,13],[450,13],[452,12],[455,13],];

console.log(cxray.sort((a, b) => a[1] - b[1] || a[0] - b[0]));

edited Jul 14, 2017 at 11:30

answered Jul 14, 2017 at 11:28

Erazihel

7,6456 gold badges34 silver badges56 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Rajesh Dixit Over a year ago

Please add explanation as you are answering for readers and not just OP

Jonas Wilms · Accepted Answer · 2017-07-14 11:28:39Z

1

cxray.sort(([ax,ay],[bx,by])=>ay-by||ax-bx);

Simply sort after y first. If ay equals by, ay-by will be 0, so thanks to the or operator it will be then sorted after x.

answered Jul 14, 2017 at 11:28

Jonas Wilms

139k20 gold badges164 silver badges164 bronze badges

Collectives™ on Stack Overflow

JavaScript, How to sort array by two sub index

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related