True, but those languages have a strong set of idioms for coding. For example, even though Ruby supports mutable calls, they are generally the exception and denoted with a ! (eg map vs map!) Meanwhile, Python is idiomatically opposed to map (to the point of intentionally crippling lambdas) in favor of list comprehensions.

My concern is whether Java8 will spark a strong change in idiomatic usage or if it will just be another incremental change to the current status quo.