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In this class, we have been focused on general object-oriented design techniques, patterns, and practices. It is worth talking a little but more about language differences. Now as far as I was able, I made this course as generic as possible, and we've explored a few examples in different languages--a few more using Java as it's a common well-known language with typical implementation of these concepts. But when you're comparing languages, what you will you find as one of the biggest differences is does the language support multiple inheritance. C++ does, Ruby does using a feature called Mixins, but most languages on this list allow and enforce only single class inheritance.
Most of these languages are statically typed, meaning all variables are declared with a specific type as opposed to languages like Ruby, which is dynamic. And there are always arguments about which one is better. It tends to be an argument that involves flexibility of a dynamic language versus the compile time error checking of a static language, but it doesn't really affect the material we've explored here that much. Although, as I've mentioned, dynamic languages don't enforce the formality of things like interfaces simply because the point of a dynamic language is to avoid all the explicit checking of what an object will and will not respond to and leave that to runtime.
The concepts we've explored here work across many, many languages, not just the one shown here, and I will leave it to you to explore the specifics of implementation in your chosen language.
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