How do I access object properties in JavaScript?

How do I access object properties in JavaScript?

You can access object properties in JavaScript using dot notation or bracket notation. For example, if you have an object let obj = {name: 'Alice', age: 25};, you can access the name with obj.name or the age with obj['age'].

What's the difference between dot notation and bracket notation?

Dot notation is simpler and more readable, but bracket notation is useful for property names that are dynamic or not valid identifiers, like obj['first-name'].

Can I access nested object properties?

Yes, you can access nested properties using the same notations. For example, if you have let obj = {person: {name: 'Alice'}};, you can access the name with obj.person.name.

What if the property doesn't exist?

If you try to access a property that doesn't exist, it will return undefined. You can check for existence using the in operator or by checking if the property is undefined.