Objects & properties

Keep related things together

Lesson 7 of 20 · 7 min · Module 3: Collections & meaningful data

An object groups related values under meaningful names. It is a small model of something in your program.

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By the end, you’ll be able to…

Group related values in an object
Read properties with dot notation
Use different records with the same function

The idea

Use curly braces to create an object. Access a property with a dot, such as profile.name. A function can read an object and return a useful result.

const profile = { name: "Alex", lessons: 4 };
console.log(profile.name);

01Keys give a value context

A name and a lesson count belong to the same profile. An object holds them under named properties, making the relationship clearer than two unrelated values.

const profile = { name: "Alex", lessons: 5 };
console.log(profile.name, profile.lessons);

Output

Alex 5

02Use the parameter you receive

describe(person) should read person.name and person.lessons. Reading the global profile instead would ignore other records passed into the function.

Your turn

Create profile with name: "Alex" and lessons: 5. Write describe(person) to return a message like "Alex has completed 5 lessons.".

What the checks look for

profile stores Alex and 5 lessons
Describes Alex’s progress
Works with a different person

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Take this with you

Objects model related data; functions let the same behavior work with many records.