This page contains information about advanced topics that I have been asked.
The implode
and explode
functions change strings to and from lists of single letters.
To randomize a list, import racket/list
and then use the shuffle
function.
If you are actually looking at lists, you should change to Beginning Student with List Abbreviations.
(require picturing-programs)
(require racket/list)
(define (mix letters)
(implode
(shuffle
(explode letters))))
(mix "alphabet soup")
There is an optional second argument to number->string
that is the base to work in.
(check-expect (number->string 31 2) "11111")
Single characters are different from single letter words. Racket uses #\a
to denote the character “a
” and "a"
to denote the word containing a single letter a. Usually you do not work with characters, but…
The make-string
command takes in a number and a character to repeat (meaning #\a
not "a"
). Example: (check-expect (make-string 7 #\a) "aaaaaaa")
.
The replicate
command repeats a string a certain number of times.
Example: (check-expect (replicate 2 "moo") "moomoo")
.