Classes & Object-Oriented Programming

REK supports class-based object-oriented programming. Classes act as blueprints for creating objects with shared methods and state.

Defining a Class

Use the class keyword. The init method is the constructor.

class User {
    fn init(name, email) {
        this.name = name
        this.email = email
        this.active = true
    }

    fn describe() {
        return this.name + " (" + this.email + ")"
    }
}

Creating Instances

Use the new keyword to create an instance of a class.

let alice = new User("Alice", "alice@example.com")
log(alice.describe())

The this Keyword

Inside methods, this refers to the current instance. You can use it to access or modify properties.

Inheritance

REK supports single inheritance using the < symbol.

class Admin < User {
    fn init(name, email, level) {
        super.init(name, email)
        this.level = level
    }

    fn deleteUser(user) {
        log("Deleting " + user.name)
    }
}

let admin = new Admin("Bob", "bob@admin.com", "super")
admin.describe() // Inherited method
admin.deleteUser(alice)