# 
#  Dart inheritance

**Inheritance** is a class's capability to derive properties and behaviors from another class.

**Dart** allows one class to inherit from another and allows it to generate a new class from an existing one. To do this, we use the **`extend`** keyword.

# 
#  Single-level inheritance

**Single-level inheritance** is a case of inheritance where a single class inherits from the **parent class**.

##
## Terminology in inheritance

- **Parent class:** This is the class from which the child class inherits its properties. It is also known as the base class or superclass.
- **Child class:** This is the class that inherits the properties of another class. It is also known as a subclass or derived class.

##
## Syntax

```
class parent_class{
...
}

class child_class extends parent_class{
...
}
```
The figure below visually represents single-level inheritance in Dart.




# 
## Code

The following code shows how to implement single-level inheritance:


// Dart program to show hierarchical inheritance
  
// Creating the parent class
class Animal{
    // Creating an attribute
    String breed;
  // Creating a function
  void display(){
    print("This is the Animal class called Parent class");
  }
}

// Creating a child class
class Cat extends Animal{
  // Creating a function
  void meow(){
      print("$breed meow everytime.");
  }
}
  
void main() {
  // Creating an object of the class Cat
  var cat = Cat();
  cat.breed = "Maine Coon";
  cat.meow();

  // Creating an object of the superclass Animal
  var animal = Animal();
  animal.display();

}

# 
## Code explanation

**Line 5 to 12**: We create the parent class called `Animal`, with the attribute `breed` and the function `display()`.

**Lines 14 to 20**: We create a child class called `Cat` with the function `meow()`. It inherits the `breed` property of the parent class.

**Lines 22 to 32**: In the main drive, we create objects of the classes `Cat` and `Animal`. Finally, we assign value to the `breed` attribute using the class' objects, and invoke the function. 

>**Note:** The class `Cat` inherits the `breed` attribute from the parent class `Animal`. 




What is single-level inheritance in Dart?

Dart inheritance

Single-level inheritance

Terminology in inheritance

Syntax

Code

Code explanation