October 2018
Intermediate to advanced
590 pages
15h 5m
English
Content preview from Building Applications with Spring 5 and Vue.js 2
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The Liskov Substitution Principle (LSP)
In 1988, Barbara Liskov wrote this principle in the following way as a way to identify subtypes:
What is wanted here is something like the following substitution property: if for each object o1 of type S there is an object o2 of type T so that for all programs P defined in terms of T, the behavior of P is unchanged when o1 is substituted for o2, then S is a subtype of T.
And it is paraphrased as the following by Robert C. Martin in his book, Agile Software Development: Principles, Patterns, and Practices:
Subtypes must be substitutable for their base types.
Here, we're going to use the square/rectangle problem from Agile Software Development: Principles, Patterns, and Practices, as an example of a violation ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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