‘Higher-order functions’ is a fancy term for functions that take other functions as arguments or that return functions. Very powerful!

In the past two columns, we’ve looked at higher-order functions and talked a little bit about the power of functional programming. So far, the concepts we’ve covered do little to indicate how ...

The return of the function is guaranteed. It always works the same way, no matter when or where it is invoked. The return is the same on Tuesday as it was on Monday. Hence, the function is ...