Practical list construction

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Introduction to Functional Programming in Scheme - slide 14 : 49

Practical list construction

cons is the basic list constructor function - but it can be applied through a number of other means as well

List and S-expression construction:
- Deep cons expressions
- Using the list function
- Using quote or quasiquote also known as backquote

Expression	Value
(cons 1 (cons 2 (cons (+ 1 2) '())))	(1 2 3)
(list 1 2 (+ 1 2))	(1 2 3)
(quote (1 2 (+ 1 2)))	(1 2 (+ 1 2))
'(1 2 (+ 1 2))	(1 2 (+ 1 2))
(quasiquote (1 2 (unquote (+ 1 2))))	(1 2 3)
`(1 2 ,(+ 1 2))	(1 2 3)

Every second element of a list

R5RS: Quasiquotation