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“As Bob Dylan said, "...the times they are a changin'."   The strange world of functional programming, once restricted to more esoteric languages such as LISP, Erlang and Haskell, is now invading the mainstream.  Languages such as C# and Java are now incorporating concepts once unique to functional programming languages.  These changes should bring simplicity to these more mainstream languages, but I find they are often misunderstood (by myself for certain) and thereby misused or not taken advantage of.  I've had a fair understanding of closures for a while, but wanted to develop a more solid understanding, ergo this post.” source...