Thanks for links to accurate information, those who posted TL;DR - most of what is added in 2019 I can already do with Ramda.js, and it works in IE11, as well.

Thanks for links to accurate information, those who posted TL;DR - most of what is added in 2019 I can already do with Ramda.js, and it works in IE11, as well. Pity about the Ruby / Groovy style dot-condition-chaining NOT being in the 2019 features, though.