Classes

Declaration

To declare a class, use the class keyword:

class Person(name) {
    // Property
    @name = name
    
    // Method
    @greet() {
        puts 'Hi, I am ' + @name
    }
}

This will create a class named Person, whole of class body is the constructor and param name is its parameter.

@name is a property, @greet is a method instance of this class.

There is no "this", just access class members through @.

To create an instance of the Person, just call it:

var p = Person('John')

Now, access the members of this instance:

puts p.name    // John
p.greet()      // Hi, I'm John

You can also declare a class without param in initializer.

class Food {}        // equivalent to Food()
var myFud = Food()   // create instance

The class name should start with an uppercase character to distinguish it from the function name.

Static members

We do not support to declare static members in class body directly. Fortunately, a class is an object, so you can assign properties for it.

Static properties

class Dog {}

Dog.A = 'Shiba'
Dog.B = 'Corgi'

Static methods

Dog.check = () => {
    // do something
}

Inheritance

Create a base class:

class Animal(name) {
    @name = name
    @speek() {
        puts 'Hi hooman'
    }
}

Extend superclass:

class Dog(name) : Animal {
    @(name)    // call super
}

var dog = Dog('Shibe')
dog.speak()    // Hi hooman

Override method:

class Dog(name) : Animal {
    @name = name
    @speak() {
        puts 'Hallo, I am ' + @name
    }
}

Notes

Like a function, you cannot declare a class in non-top-level of code.

{
    class A() {}
//  ^^^^^-- Cannot declare class in non-top-level of code. 
}