Private properties and methods are those which can be accessed only in the class.
These properties and methods are not inherited.
To make a property or a method in a class private, you need to use the # symbol before the property name or method name.
⚠️ NOTE: Private property and methods is a new addition to JavaScript. Use with caution.
class User {
// private property
#category = "User";
// public property
isAlive = true;
// private method
#checkUserAlive() {
return isAlive;
}
}
Here you can see that we added a special symbol # to the property category and method checkUserAlive() method.
Now if you try to access the private property or method outside the class it will throw an error.
class User {
// private property
#category = "User";
// public property
isAlive = true;
// private method
#checkUserAlive() {
return isAlive;
}
}
// create a object
const john = new User();
// try to access private property category
console.log(john.#category); // error
// try to call checkUserAlive() private method
console.log(john.#checkUserAlive()); // error
You can only use the private properties and methods for usage within the class only.