JSFiddle - React, Tailwind, and code Playground

by Durtto

JavaScript

var arr = [
    {empID:100,empName:"greg"},
    {empID:101,empName:Math},
    {empID:100,empName:"greg"}
];

var results = [];
var idsSeen = {}, idSeenValue = {};
for (var i = 0, len = arr.length, id; i < len; ++i) {
    id = arr[i].empID;
    if (idsSeen[id] !== idSeenValue) {
        results.push(arr[i]);
        idsSeen[id] = idSeenValue;
    }
}