Adding an Element with id in JavaScript

Let the variable arr contain an array of objects:

let arr = [
	{
		id: 'GYi9GauC4gBF1e2SixDvu',
		prop1: 'value11',
		prop2: 'value12',
		prop3: 'value13',
	},
	{
		id: 'IWSpfBPSV3SXgRF87uO74',
		prop1: 'value21',
		prop2: 'value22',
		prop3: 'value23',
	},
	{
		id: 'JAmjRlfQT8rLTm5tG2m1L',
		prop1: 'value31',
		prop2: 'value32',
		prop3: 'value33',
	},
];

Let another variable store the object that we want to make a new element of our array:

let newElem = {
	id: 'GMNCZnFT4rbBP6cirA0Ha',
	prop1: 'value41',
	prop2: 'value42',
	prop3: 'value43',
};

Let's consider the immutable addition of such an element. Let's create a copy of the array and add a new element to it:

let copy = Object.assign([], arr);
copy.push(newElem);
let res = copy;

Or use destructuring:

let res = [...arr, newElem];

Given an array of objects. Create a button that, when clicked, will add a new element to it. Let the id be generated by a function.