Liskov Substitution Principle.md

Liskov Substitution Principle (LSP)

The LSP states that objects of derived classes should be able to replace objects of the base class without affecting program correctness.

Bad Example - Violating LSP

class Bird {
    fly() {
        // Bird-specific flying behavior
    }
}

class Ostrich extends Bird {
    fly() {
        // Ostriches cannot fly, but this method is inherited
    }
}

In this example, the Ostrich class violates LSP because it inherits the fly() method from Bird, but ostriches cannot fly.

##Good Example - Following LSP:

class Bird {
    fly() {
        // Bird-specific flying behavior
    }
}

class Ostrich {
    // Ostrich-specific behavior, no fly() method
}

In this improved example, we have a separate Ostrich class without the fly() method. This adheres to LSP because you can use an Ostrich object wherever you use a Bird object without unexpected behavior.