Classes & Object-Oriented Programming
Djazair provides an intuitive class-based OOP model with constructors (init), instance state (self), single inheritance (is), parent dispatch (super), and type verification (instanceof).
Declaring Classes & Instantiation
djazair
class Person
init(name, age)
self.name = name
self.age = age
end
greet()
print("Hi, I am ${self.name}, age ${self.age}.")
end
end
# Instantiating with new
let p = new Person("Riad", 28)
p.greet() # => Hi, I am Riad, age 28.Inheritance & super
Classes inherit using the is keyword. Child classes invoke parent constructors via super.init(...):
djazair
class Person
init(name, age)
self.name = name
self.age = age
end
end
class Employee is Person
init(name, age, role)
super.init(name, age)
self.role = role
end
# Overriding method
greet()
print("Hello, I am ${self.name}, working as a ${self.role}.")
end
end
let emp = new Employee("Sarah", 32, "Lead Architect")
emp.greet() # => Hello, I am Sarah, working as a Lead Architect.Type Verification with instanceof
The instanceof operator verifies whether an object is an instance of a class, its superclasses, or primitive type names:
djazair
class Person
end
class Employee is Person
end
let emp = new Employee()
print(emp instanceof Employee) # => True
print(emp instanceof Person) # => True (inherited)
print(emp instanceof "String") # => False
# Can also check primitive string types:
print("hello" instanceof "String") # => True
print(42 instanceof "Number") # => True