Object.assign(obj1, obj2);
let newObject = Object.assign({}, obj1, obj2, obj3, etc);

var urlParams = new URLSearchParams(window.location.search);

console.log(urlParams.has('post')); // true
console.log(urlParams.get('action')); // "edit"
console.log(urlParams.getAll('action')); // ["edit"]
console.log(urlParams.toString()); // "?post=1234&action=edit"
console.log(urlParams.append('active', '1')); // "?post=1234&action=edit&active=1"

window.localStorage.setItem('test', 'hola');

• setItem(): Add key and value to localStorage
• getItem(): Retrieve a value by the key from localStorage
• removeItem(): Remove an item by key from localStorage
• clear(): Clear all localStorage
• key(): Passed a number to retrieve nth key of a localStorage