Functional programming in Maple
===============================

Function composition and application
------------------------------------

@, @@, x -> x

curry, rcurry

apply, unapply

' (uneval)

Basic list operations
---------------------

cons := (x, xs) -> [x, op(xs)];
first := xs -> if xs = [] then [] else op(1, xs) end if;
rest := xs -> if xs = [] then [] else op(2..nops(xs), xs) end if;

Sequence comprehensions
-----------------------

seq, $

Filtering
---------

select, remove, selectremove

Iteration
---------

map, zip

Catamorphisms
-------------

foldr, foldl, add, mul, andmap, ormap

Lexical scoping
---------------

use ... in ... end use (but see its help page for possible
misunderstandings with regard to simplification).

What you print is what you read
-------------------------------

This is not related to functional programming but Lisp has this
capability of printing data types in a format (s-expressions) that can
be read back at the REPL (prompt) and which is very amenable for
debugging purposes, etc.  The analogous functionality in Maple can be
enabled with:

interface('prettyprint' = 0):