Class

Define classes with the class keyword. Classes bundle fields and methods into a single type.

Classes

Example:

class Person {
  var name: str
  var age: int
  init(name: str, age: int) -> nthg {
      self.name = name
      self.age = age
  }
  print() -> nthg {
      print(self.name, " is ", self.age, " years old.")
  }
  getAge() -> int {
      return self.age
  }
  setAge(age: int) -> nthg {
      self.age = age
  }
}
const person: Person = new Person("Alice", 30)
person.print()
print("\n", person.getAge())

Output:

Alice is 30 years old.
30

Person has two fields (name, age), three methods (print, getAge, setAge), and a constructor (init) that sets the initial values. Create instances with new.

Multiple Constructors Example

Define multiple constructors by marking additional ones with fun init (the first init stays bare). Each can accept different parameters:

class Person {
  var name: str
  var age: int
  init(name: str, age: int) -> nthg {
      self.name = name
      self.age = age
  }
  /; Second constructor — name only, default age
  fun init(n: str) -> nthg {
      self.name = n
      self.age = 0
  }
}

The self Keyword

self refers to the current instance. It's automatically available in every method — you never pass it explicitly:

• self.field — read a member
• self.method() — call another method
• self.field = value — modify a member