There’s a lot of interest and mystery about Functional Programming. This is one of an ongoing series of posts about it.
In the linked post, author Duncan McGreggor estimates only 10-20% of US tech companies have major investments in Functional Programming. Notable abstainer: Google. Why?
New programmers with little experience to defend find it easier to learn new methodologies. Senior engineers will pick up new tech, like Functional Programming, if they’re 1) research/academic oriented, 2) easily bored, or 3) have little competitive drive. FP seems to be most adopted by smaller companies, because it’s easier to hire/train up a critical mass of experts in the subject.