Classes

Object-oriented programming in Tenet.

Declaration

class Person {
    init(name, age) {
        this.name = name;
        this.age = age;
    }
    
    greet() {
        print "Hi, I'm " + this.name;
    }
}

Instantiation

Create an instance by calling the class like a function:

var alice = Person("Alice", 25);

Properties

alice.name;        // Get property: "Alice"
alice.age = 26;    // Set property
alice.job = "Dev"; // Add new property

Methods

alice.greet();  // Hi, I'm Alice

The this Keyword

Inside methods, this refers to the instance:

class Counter {
    init() {
        this.count = 0;
    }
    
    increment() {
        this.count = this.count + 1;
        return this.count;
    }
}

var c = Counter();
print c.increment();  // 1
print c.increment();  // 2

Inheritance

Use < to inherit from a superclass:

class Animal {
    speak() {
        print "Some sound";
    }
}

class Dog < Animal {
    speak() {
        print "Woof!";
    }
}

var dog = Dog();
dog.speak();  // Woof!

The super Keyword

Call superclass methods:

class Animal {
    init() {
        this.alive = true;
    }
}

class Dog < Animal {
    init(name) {
        super.init();  // Call parent constructor
        this.name = name;
    }
}

var buddy = Dog("Buddy");
print buddy.alive;  // true
print buddy.name;   // Buddy

Complete Example

class Player {
    init(name) {
        this.name = name;
        this.score = 0;
    }
    
    addPoints(points) {
        this.score = this.score + points;
        print this.name + " now has " + this.score + " points";
    }
    
    describe() {
        print "Player: " + this.name + " (Score: " + this.score + ")";
    }
}

var p1 = Player("Alice");
var p2 = Player("Bob");

p1.addPoints(10);  // Alice now has 10 points
p2.addPoints(5);   // Bob now has 5 points
p1.describe();     // Player: Alice (Score: 10)

Next Steps