They have these in several languages. f.e. java
Something for OE?
Lambda is so powerful indeed. Not sure they can compare with OE find/foreach in an indexed temp-table, plus the cool aspect one can handle a temp-table or a db-table the same way, but again... one crucial missing point to compete is the multi-threading capabilities of C# and Java
And allas, that seems hard to retrofit into the language community.progress.com/.../1902
Besides it is questionable if opening the door to functional programming would help us abl developers much.
queue.acm.org/detail.cfm (article from 2014 with subtitle "Mostly functional" programming does not work by Erik Meijer, a Dutch computer scientist and entrepreneur. From 2000 to early 2013 he was a software architect for Microsoft where he headed the Cloud Programmability Team).