how to get index number of a row in table in aura iteration in Salesforce?

Hi,

I am sharing an example you can take help from this for your senerio:-

<a href="javascript:void(0);" id="{!idx}" onclick="{!c.editAffiliation}">Edit</a>

editAffiliation : function(component, event, helper) {
    helper.editRecord(component, event);
}

editRecord : function(cmp, ev) {
    var afList = cmp.get('v.afList');
    var affiliation = afList[ev.srcElement.id];
    this.openModal(affiliation);
}