How to define custom sort function in javascript?

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It could be that the plugin is case-sensitive. Try inputting Te instead of te. You can probably have your results setup to not be case-sensitive. This question might help.

For a custom sort function on an Array, you can use any JavaScript function and pass it as parameter to an Array‘s sort() method like this:

var array = ['White 023', 'White', 'White flower', 'Teatr'];

array.sort(function(x, y) {
  if (x < y) {
    return -1;
  }
  if (x > y) {
    return 1;
  }
  return 0;
});

// Teatr White White 023 White flower
document.write(array);

More Info here on
Array.sort.

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