I'm having issue to Add/Update array of object based on key

I'm having data like this,

let employeeDetails1 = [
{ name: "Raju", age: 26 },
{ name: "Kumar", age: 31 },
];

let employeeDetails2 = [
{ name: "Raju", age: 26 },
{ name: "Siva", age: 35 },
];

i'm expecting format like,

let employeeDetails = [
{ name: "Raju", age: 26 },
{ name: "Kumar", age: 31 },
{ name: "Siva", age: 35 },
];