link index property

[jonabox]

Hi, I'm trying to figure out where the .index property for links and nodes is generated. I'm trying to investigate why the code below removes the wrong link when I try to remove many links at a time:

removeLink (link) {
   this.unSelectLink(link.id);
   this.links.splice(link.index, 1);
}

and here's my full code, where removeLink is called:

for (let removedNodeId of serverResponse.data.nodesRemoved) {
        let edgeToRemove = this.links.findIndex(
          (edge) =>
            edge.sid == this.lastSelected.id && edge.tid == removedNodeId
        );
        this.removeLink(edgeToRemove);
}

The result is that the wrong link gets removed and I'm not sure why. I believe the culprit is the index property in the splice method, which might be getting overwritten when retrieved. But the question is, where is the .index property getting assigned? I haven't been able to find it in the codebase.