CHICKEN
(c) 2008-2022, The CHICKEN Team
(c) 2000-2007, Felix L. Winkelmann
Version 5.3.1 (utf) (rev e910b74d)
linux-unix-gnu-x86-64 [ 64bit dload ptables ]

Type ,? for help.
#;1> (define foo "abcαβdef")
#;2> foo
"abcαβdef"
#;3> ,d #
string of length 8
 0: #\a
 1: #\b
 2: #\c
 3: #\α
 4: #\β
 5: #\d
 6: #\e
 7: #\f
#;3> (string-ref foo 6)
#\a
#;4> 
#\α
#;5> 
#\β
#;6> 
#\e
#;7> (string->list foo)
(#\a #\b #\c #\α #\β #\d #\e #\f)
#;8> (list->string #)
"abcαβdef"
#;9> (string-fill! foo #\¼)
#;10> foo
"xxxxxxxx"
#;11> ,d #
string of length 8
 0: #\x	(followed by 7 identical instances)
 ...
#;11> 
#;12> foo
"¼¼¼¼¼¼¼¼"
#;13> ,d #
string of length 8
 0: #\¼	(followed by 7 identical instances)
 ...
#;13> (string-set! foo 3 #\_)
#;14> foo
"¼¼¼_¼¼¼¼"
#;15> ,d #
string of length 8
 0: #\¼	(followed by 2 identical instances)
 ...
 3: #\_
 4: #\¼	(followed by 3 identical instances)
 ...
#;15>