Well... for some of us, when you say "functional programming", you say "Haskell". And it certainly had all of those features, and much more, more than 20 years ago.

I really like another poster's recommendation that it be called "combinator-oriented programming". Because, while ES, Java, and even Rust, supports rich combinator-oriented programming, I wouldn't dare call any of them functional programming languages.

Though, one has to admit, with ES6 now even supporting elegant currying, coupled with a good functional programming library like Ramda, and immutable data structures (Immutable JS), ECMAScript comes pretty close if you really want it to.

The difference is, any code anywhere can "drop out of" the functional world, whereas a functional language like Haskell enforces functional purity throughout.

Good times to be a software engineer, nevertheless!