‘Higher-order functions’ is a fancy term for functions that take other functions as arguments or that return functions. Very powerful! Last week, I casually dropped the term “higher-order function” ...

With its first class functions, JavaScript doesn't really need lambdas, but it has them and they are useful. Find out the mysteries of the lambda in Jem 11. Lambda expressions sound advanced and ...

JavaScript doesn't have a native namespace facility so how are you supposed to keep utility and helper functions private? The solution is to use inner functions but this is just the start of the story ...