JSFiddle - React, Tailwind, and code Playground

JavaScript

var a = {
    id: 1,
    qtde: 2
};
var b = {
    id: 1,
    nome: 'teste'
};

function mergeObjects(source, target) {
    Object.keys(source).forEach(function(key) {
        target[key] = source[key];
    });
}
mergeObjects(a, b);
console.log(b); // Object {id: 1, nome: "teste", qtde: 2}