JSFiddle - React, Tailwind, and code Playground

JavaScript

function celebrityIDCreator(theCelebrities) {
    var uniqueID = 100;
    for (i = 0; i < theCelebrities.length; i++) {
        theCelebrities[i].id = function () {
            return uniqueID + i;
        }();
    }

    return theCelebrities;
}

var actionCelebs = [{
    name: "Stallone",
    id: 0
}, {
    name: "Cruise",
    id: 0
}, {
    name: "Willis",
    id: 0
}];

var createIdForActionCelebs = celebrityIDCreator(actionCelebs);

var stalloneID = createIdForActionCelebs[0];
alert(stalloneID.id); // 100

var cruiseID = createIdForActionCelebs[1];
alert(cruiseID.id); // 101

var willisID = createIdForActionCelebs[2];
alert(willisID.id); // 102