Why do you put commas after the last item in arrays and skip semi colons at the end of statements? Seems wrong.

I agree with Jason, but I'd add that even though the language doesn't require semicolons at the end of a statement when nothing else is on the same line, it is considered a "best practice". This is because it makes it much less likely that errors will be introduced when the code is modified later. It can also make it easier for someone reading the code to distinguish between complete statements and expressions that take more than one line.

Another "best practice" is using nest-level indentation. While it's not required by the language (unlike Python), it's still considered a "best practice" as it makes reading and maintaining the code much easier.

I really appreciate how the examples in the Treehouse teachings are generally consistent about using the best practices for each language.

HI Ronald,

That is just how the creators designed JavaScript. Every language (and creator of a language) will have its own syntax, based on what they want to do.
Look at Ruby, for example. There are no commas, no semicolons, no curly braces, nothing. It's kind of like Python that way, except in Python Indentation and Whitespace is crucial and absolute, yet in almost every other language, neither of those matter.

There will obviously be some similar syntax rules across different languages, but usually there are many more differences.

Keep Coding! :)