Stop show with sound -- Keyboard shortcut: 'x'  Next slide in show -- Keyboard shortcut: 'n'  4 minutes, 19 secondsExpressions, Types, and Functions - slide 20 : 46

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

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)
Go to exercise
Every second element of a list