adding all the elements of a list of objects in JavaScript code example

Example 1: js push in object

let obj = {};
let objToAdd1 = { prop1: "1", prop2: "2" };
let objToAdd2 = { prop3: "3", prop4: "4" };

// obj variabile could be empty or not, it's the same
obj = { ...obj, ...objToAdd1 };
obj = { ...obj, ...objToAdd2 };

// Note that i used the spread operator... This syntax is available
// only for the most recent js ES (from ES6 on, if i'm not wrong) :)

console.log(obj);

Example 2: javascript add to object

var element = {}, cart = [];
element.id = id;
element.quantity = quantity;
cart.push(element);

// Array of Objects in form {element: {id: 10, quantity: 10} }
var element = {}, cart = [];
element.id = id;
element.quantity = quantity;
cart.push({element: element});