Liskov Substitution Principle

Published: 10 October 2023
on channel: ProgRank

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Liskov's notion of a behavioral subtype defines a notion of substitutability for objects; that is, if S is a subtype of T, then objects of type T in a program may be replaced with objects of type S without altering any of the desirable properties of that program (e.g. correctness).

Liskov Substitution Principle (LSP) is all about well-designed inheritance, when you inherit from a base class, you should be able to substitute your derived class with the base class without things going wrong. Otherwise,
you have used inheritance incorrectly!

In mathematics, a Square is a Rectangle. Square derived from Rectangle
Imagine you had SetWidth and SetHeight methods on your Rectangle base class; this seems perfectly logical. if your Rectangle reference pointed to a Square, then SetWidth and SetHeight don't make sense?

The major difference between a square and a rectangle is that a square has all its sides equal, whereas a rectangle has its opposite sides equal.

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