Adding a new value to an object

In JavaScript, you can add a new value to an object using the following methods:

1. Assignment: You can assign a new value to a property that doesn't exist in the object using the dot notation or bracket notation.

Example:

const person = {};
person.name = 'John'; // adds a new property "name" with value "John"

2. Bracket notation: You can use the bracket notation to add a new property to the object.

Example:

const person = {};
person['age'] = 30; // adds a new property "age" with value 30

3. Object spread: You can use the object spread operator ({... }) to add new properties to an object.

Example:

const person = { name: 'John' };
person = {...person, age: 30 }; // adds a new property "age" with value 30

4. Object.assign: You can use the Object.assign method to add new properties to an object.

Example:

const person = { name: 'John' };
Object.assign(person, { age: 30 }); // adds a new property "age" with value 30

5. Dynamic property names: You can use a variable to create a dynamic property name and add a new value to the object.

Example:

const person = {};
const propertyName = 'age';
person[propertyName] = 30; // adds a new property "age" with value 30

Note that if the property already exists in the object, the new value will overwrite the existing value.