‘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” ...

As a front-end developer, I meet a lot of people who write JavaScript. The majority of them do little more than include jQuery and a few plug-ins in order to add a fancy lightbox effect or an image ...

Support your confidence in this topic by refreshing your knowledge of substitution and changing the subject of formulae. A function takes an input value, applies a rule to it, and produces an output ...