What is the result of the following expressions?
(list-ref (make-list 1) 0)
(string-ref (make-string 1) 0)
(vector-ref (make-vector 1) 0)
(bytevector-u8-ref (make-bytevector 1) 0)Surprisingly, some of the values are random (which is perfectly fine according to the standards).
| System | list | string | vector | bytevector |
|---|---|---|---|---|
| Bigloo | #unspecified |
#\space |
#unspecified |
|
| Biwa | #\space |
(unspecified) |
||
| Chez | #<void> |
#\nul |
0 |
random, but most often zero (?) |
| Chibi | #<undef> |
#\space |
#<undef> |
0 |
| Cyclone | #f |
#\space |
#f |
random! |
| Gambit | 0 |
#\null |
0 |
0 |
| Gauche | #f |
#\space |
#<undef> |
|
| Chicken | #\space |
#<unspecified> |
||
| Guile | '() |
#\nul |
#<unspecified> |
|
| Kawa | #!null |
#\space |
#!null |
0 |
| LIPS | #<undefined> |
#\space |
#<undefined> |
0 |
| Loko | #\nul |
0 |
0 | |
| MIT | #!default |
#\null |
#f |
0 |
| Racket | #\nul |
0 |
||
| Sagittarius | #\space |
#<unspecified> |
0 | |
| Scheme48 | #\? |
#{Unspecific} |
||
| SCM | random! | #<unspecified> |
||
| STklos | #void |
0 |
#void |
0 |
| TinyScheme | #\space |
'() |
||
| Unsyntax | #<undef> |
#\space |
#<undef> |
0 |
| Ypsilon | #f |
#\space |
#<unspecified> |
0 |
| ABCL | NIL |
#\Null |
NIL |
|
| CCL | NIL |
#\Null |
0 |
|
| Clisp | NIL |
#\Null |
NIL |
|
| CMUCL | NIL |
#\Null |
0 |
|
| ECL | NIL |
#\space |
NIL |
|
| GCL | NIL |
#\space |
NIL |
|
| SBCL | NIL |
#\Null |
0 |