Objects in JavaScript

Source: Dev.to

What is Objects?

• An object is a variable that can hold multiple variables.
• It is a collection of key‑value pairs, where each key has a value.
• Combination of states (attributes) and behavior (methods).
• Declare an object with the const keyword.

Example

const person = {
  name: "Jack",
  age: 41,
  city: "New York"
};
console.log(person.name);

Adding New Attributes

Example

const person = {
  name: "Jack",
  age: 41,
};

person.city = "New York"; // Add attribute
console.log(person.city);

Deleting Existing Attributes

• The delete keyword removes a property from an object.

Example

const person = {
  name: "Jack",
  age: 41,
  city: "New York"
};

delete person.city; // Delete attribute
console.log(person);

Updating Attributes

• Assign a new value to the same key (same syntax as adding).

Example

const person = {
  name: "Jack",
  age: 41,
  city: "New York"
};

person.age = 42;
console.log(person.age);