TL ; DR:
A property is a piece of data attached to an object. In JavaScript you don't declare them in the class — you just assign them with the dot operator:
let dog = new Dog(); dog.name = "Rex"; dog.age = 4;
Each object has its own properties, so two dogs can have different names without interfering.
Full lesson:
Right now your Dog class is just an empty shell — every Dog object you create is identical. We need a way to attach data to each object.
In JavaScript, the data attached to an object is called a property. (Other languages call them fields or attributes — same idea.)
Setting properties
JavaScript is a dynamic language: you don't have to declare a property up front. Just assign to it with the dot operator:
let dog = new Dog();
dog.name = "Rex";
dog.age = 4;
After this, dog has a name property equal to "Rex" and an age property equal to 4.
Reading properties
console.log(dog.name); // Rex
console.log(dog.age); // 4
You read properties the same way you set them — with the dot operator.
Each object has its own properties
let rex = new Dog();
let luna = new Dog();
rex.name = "Rex";
luna.name = "Luna";
// rex.name is "Rex", luna.name is "Luna" — they don't interfere.
Your task
The Dog class is already defined for you. Below it, set dog.name to "Rex" and dog.age to 4. The pre-filled console.log will then show:
Rex is 4 years oldFree plan: 30 tutor messages. PRO is unlimited.
