Something is wrong with the typescript tests. It keeps expecting an empty array, when it should expect the duplicates which are similar to the provided test case. Here's the result I get. Am I missing something?

Input: [ { x: 1, y: 1 }, { x: 1, y: 1, z: 3 } ]
Actual: [ { x: 1, y: 1 }, { x: 1, y: 1, z: 3 } ]
Expected: []

Thanks. I already understood the sort method. I was unaware that zero was considered falsy, since I foolishly assumed all numbers would evaluate to truthy. It's clear to me now. Thanks again.

Love this solution. Would you mind explaining how the compareStats and sortStats functions work? I thought that negative numbers would evaluate to truthy, so I'm having trouble following the logic.

Yeah, that's my bad. I just resubmitted the previously failing Typescript version and it worked. But I'm new here and don't know how to close an issue.