Classes

A class is an object-oriented structure similar to an interface which defines a specific type of object. It can contain properties and methods that define the behavior of the object, which can be altered by a setup method called constructor.

See also Interfaces.

Syntax

class IDENTIFIER {
    [ FIELD_DECLARATION ]
    [ METHOD_DECLARATION ]
    [ CONSTRUCTOR_DECLARATION ]
}

Field Declaration

IDENTIFIER: TYPE;

Method Declaration

IDENTIFIER(PARAMETER_LIST): RETURN_TYPE {
    STATEMENT
}

Constructor Declaration

constructor(PARAMETER_LIST) {
    STATEMENT
}

Examples

Simple class definition

class Person {
    name: str;
    age: num;

    constructor(name: str, age: num) {
        this.name = name;
        this.age = age;
    }

    sayHello(): void {
        print("Hello, my name is " + this.name + " and I am " + this.age + " years old.");
    }
}

var person: Person = new Person("Alice", 25);
person.sayHello(); // -> "Hello, my name is Alice and I am 25 years old."