Question

i have data array like this

 data = [1,2,3,4,5,6,7,8,9];

i want to giving result like this, example 1 + 3 = 4, 4 + 3 = 7,ect

data = [1,4,7,2,5,8,3,6,9];

i’m using data.sort(function(x,y) { return x % 3}); but nothing happen.

or any another suggestion ?
this is my jsfiddle http://jsfiddle.net/viyancs/Yt78J/3/

Answer 1

You need to return either 0, -1 or +1 indicating the desired order of the two items passed to the sorting function.

var data = [ ... ];

data.sort(function (a, b) {
  // if the value of modulo 3 of A is lower than of B,
  // A should go first.
  if (a % 3 < b % 3) return -1;

  // if the value of modulo 3 of A is greater than of B,
  // B should go first.
  if (a % 3 > b % 3) return +1;

  // if the value of modulo 3 is the same for both A and B
  // the order should be figured out out of the items themself
  if (a < b) return -1; // A should go first
  if (a > b) return +1; // B should go first

  return 0; // order should be preserved, will never happen for your values
});