Learn how to use js to merge two objects into one object assign()

Object.assign() Method

Object.assign() Method to copy the values of all enumerable properties from one or more source objects to the target object . It will return the target object

Merge objects

var o1 = {
     a: 1 };
var o2 = {
     b: 2 };
var o3 = {
     c: 3 };
 
var obj = Object.assign(o1, o2, o3);
console.log(obj); // { a: 1, b: 2, c: 3 }
console.log(o1);  // { a: 1, b: 2, c: 3 },  Notice that the target object itself changes 

Merge objects with the same properties

var o1 = {
     a: 1, b: 1, c: 1 };
var o2 = {
     b: 2, c: 2 };
var o3 = {
     c: 3 };
 
var obj = Object.assign({
    }, o1, o2, o3);
console.log(obj); // { a: 1, b: 2, c: 3 }