Objects

Objects

Objects store key-value pairs. Keys are strings (called properties), values can be anything:

const person = {
    name: "Alice",
    age: 30,
    active: true,
};

Accessing Properties

Use dot notation or bracket notation:

console.log(person.name);       // Alice
console.log(person["age"]);     // 30

Modifying Objects

person.age = 31;          // update
person.email = "a@b.com"; // add new property

Methods

Objects can have functions as properties — these are called methods:

const circle = {
    radius: 5,
    area: function() {
        return Math.PI * this.radius * this.radius;
    },
};
console.log(circle.area().toFixed(2));  // 78.54

Your Task

Write function fullName(person) that returns the person's full name by joining person.first and person.last with a space.