find the array index of an object with a specific key value in underscore

Question

In underscore, I can successfully find an item with a specific key value

var tv = [{id:1},{id:2}]
var voteID = 2;
var data = _.find(tv, function(voteItem){ r         


        

Answer 1

Array.prototype.getIndex = function (obj) {
    for (var i = 0; i < this.length; i++) {
        if (this[i][Id] == obj.Id) {
            return i;
        }
    }
    return -1;
}

List.getIndex(obj);