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6.6.5.10 Reversing and Appending Strings

Scheme Procedure: string-reverse str [start [end]]
C Function: scm_string_reverse (str, start, end)

Reverse the string str. The optional arguments start and end delimit the region of str to operate on.

Scheme Procedure: string-reverse! str [start [end]]
C Function: scm_string_reverse_x (str, start, end)

Reverse the string str in-place. The optional arguments start and end delimit the region of str to operate on. The return value is unspecified.

Scheme Procedure: string-append arg …
C Function: scm_string_append (args)

Return a newly allocated string whose characters form the concatenation of the given strings, arg ....

(let ((h "hello "))
  (string-append h "world"))
⇒ "hello world"
Scheme Procedure: string-append/shared arg …
C Function: scm_string_append_shared (args)

Like string-append, but the result may share memory with the argument strings.

Scheme Procedure: string-concatenate ls
C Function: scm_string_concatenate (ls)

Append the elements (which must be strings) of ls together into a single string. Guaranteed to return a freshly allocated string.

Scheme Procedure: string-concatenate-reverse ls [final_string [end]]
C Function: scm_string_concatenate_reverse (ls, final_string, end)

Without optional arguments, this procedure is equivalent to

(string-concatenate (reverse ls))

If the optional argument final_string is specified, it is consed onto the beginning to ls before performing the list-reverse and string-concatenate operations. If end is given, only the characters of final_string up to index end are used.

Guaranteed to return a freshly allocated string.

Scheme Procedure: string-concatenate/shared ls
C Function: scm_string_concatenate_shared (ls)

Like string-concatenate, but the result may share memory with the strings in the list ls.

Scheme Procedure: string-concatenate-reverse/shared ls [final_string [end]]
C Function: scm_string_concatenate_reverse_shared (ls, final_string, end)

Like string-concatenate-reverse, but the result may share memory with the strings in the ls arguments.


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