Agreed. Ruby is a very fundamentally OO language, but its Enumerable interface is more comprehensive than many FP languages' equivalents (in addition to the sta

Agreed. Ruby is a very fundamentally OO language, but its Enumerable interface is more comprehensive than many FP languages' equivalents (in addition to the standard map/reduce/select, it has methods for iterating over permutations of elements, n-sized slices, etc, all of which can be made lazy), and because it's an interface you can use it with custom data types easily. But FP enthusiasts often speak as if the ML and Lisp language families have a duopoly on higher-order functions. It's odd.