[modersky]

Arrays are not collections, either in Scala, or in the blog's condensation of it. But the blog nevertheless tries to define a single extension method that works for both sequences and arrays. I do not think this problem has a simple solution in any language.

[akeefer]

That's a fair point; there's no simple way that I know of to do that in any language (though many languages avoid having both constructs), and the general solution is to write parallel sets of methods to operate on the two types of data structures.