Scheme Programmer's Manual

NAME

string-length - the length of a string

LIBRARY

(import (rnrs))                     ;R6RS
(import (rnrs base))                ;R6RS
(import (scheme r5rs))              ;R7RS
(import (scheme base))              ;R7RS

SYNOPSIS

(string-length string)

DESCRIPTION

Returns, as an exact integer object, the number of elements in string. The length of a string is fixed.

IMPLEMENTATION NOTES

All extant implementations use fixnums to represent string lengths, but this is not required.

RETURN VALUES

Returns a single value which is the length of the string.

EXAMPLES

(string-length "ABC")
          => 3

APPLICATION USAGE

The string-length procedure often appears in code that decodes or encodes data in some protocol or file format or that formats or parses strings. Sometimes an alternative is to use higher-order procedures (string-for-each(3), string-map(3)) or string ports (open-input-string(3), open-output-string(3)).

COMPATIBILITY

Apart from error handling, this procedure is the same in all Scheme reports.

ERRORS

This procedure can raise exceptions with the following condition types:
&assertion (R6RS)
The wrong number of arguments was passed or an argument was outside its domain.
R7RS
The assertions described above are errors. Implementations may signal an error, extend the procedure's domain of definition to include such arguments, or fail catastrophically.

SEE ALSO

make-string(3), string-ref(3), string-for-each(3), string-map(3), open-input-string(3).

STANDARDS

R4RS, IEEE Scheme, R5RS, R6RS, R7RS

AUTHORS

This page is part of the scheme-manpages project. It includes materials from the RnRS documents. More information can be found at

BUGS

Index

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
IMPLEMENTATION NOTES
RETURN VALUES
EXAMPLES
APPLICATION USAGE
COMPATIBILITY
ERRORS
SEE ALSO
STANDARDS
AUTHORS
BUGS
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