JavaScript object array not properly sorting

Question

I have this object array

var grps = [{
    group_no: 0,
    id: "733",
    xpos: 226.72,
    ypos: 100
}, {
    group_no: 0,
    id: "735",
    xpos: -1.19,
    ypos: 200
}];

and im trying to sort the array based on value xpos

var small_x = grps.sort(function(a, b) {
    return a.xpos - b.xpos;
});

and when i do

 console.log(small_x[0].xpos); //sort asc

I expect the value to be -1.19 but iam getting 226.72

@ArunPJohny is there any way it is not sorting correctly because of string — coolguy
– coolguy, Commented Aug 4, 2015 at 6:33
@coolguy—the xpos property is a number, so strings aren't your issue. Even if the values are strings like '-1.19' it will still work OK as the - operator coerces the operands to Number anyway (e.g. you can sort by id too even though the values are strings like "735"). — RobG
– RobG, Commented Aug 4, 2015 at 6:41
@coolguy yes... if it is doing a string comparison try jsfiddle.net/arunpjohny/cz7sasct/3 — Arun P Johny
– Arun P Johny, Commented Aug 4, 2015 at 6:42

Community · Accepted Answer · 2017-05-23 12:14:02Z

2

See below (works also for string values). The ECMA script doesn't specify which algoritm has been used. But, simply said, compare posx of a is <, > or (else) == posx of b. This returns resp. -1, 1 or 0, which could be sort simply.

See also the documentation of Mozilla Developer Network with description, examples, ECMA script notes, and the example below (conceptual): https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort

function comparePos(a, b)
{
   if (a.xpos < b.xpos)
      return -1;
   if (a.xpos > b.xpos)
      return 1;
   return 0;
}

grps.sort(comparePos);

See this: Sort array of objects by string property value in JavaScript

edited May 23, 2017 at 12:14

CommunityBot

11 silver badge

answered Aug 4, 2015 at 6:01

schellingerht

5,8062 gold badges30 silver badges56 bronze badges

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

Collectives™ on Stack Overflow

JavaScript object array not properly sorting

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related