industry functional programming seen use wide variety industrial applications example erlang developed swedish company ericsson late originally used implement fault tolerant telecommunications systems ref name armstrong since become popular building range applications companies nortel facebook lectricit de france whatsapp ref name erlang faq ref name larson ref name sim diasca ref name whatsappblog http blogwhatsappcom indexphp million million whatsapp blog last important piece infrastracture erlang ref scheme dialect lisp used basis several applications early apple macintosh computers ref
Formal science Computer science Programming languages Functional programming