How to push an object while adding a property in one operation?

I can push an array and amend extra elements to it in one, single operation like this.

let arr = [1, 2, 3];
let col = [];
col.push(arr);
col.push([...arr, 4]);

I wonder if it’s possible to achieve something like that, a one-liner for amending and pushing, for objects.

let obj = { ... };
obj.extraInfo = "shazoo";
col.push(obj);

I haven’t found anything so I’m prepared for no-go but I’ve been wrong before.

>Solution :

You can just do {...obj, extraInfo: "shazoo"}:

obj = { example: "demo" }
col = [];
col.push({ ...obj, extraInfo: "shazoo"});
console.log(col);

Or, if you need obj to itself be modified, you can do

 col.push(Object.assign(obj, {extraInfo: "shazoo"}));