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Article contents:[[tags: manual]] [[toc:]] == Module (chicken string) This module contains procedures which can perform various useful string operations. === conc <procedure>(conc X ...)</procedure> Returns a string with the string-represenation of all arguments concatenated together. {{conc}} could be implemented as <enscript highlight=scheme> (define (conc . args) (apply string-append (map ->string args)) ) </enscript> === ->string <procedure>(->string X)</procedure> Returns a string-representation of {{X}}. === string-chop <procedure>(string-chop STRING LENGTH)</procedure> Returns a list of substrings taken by ''chopping'' {{STRING}} every {{LENGTH}} characters: <enscript highlight=scheme> (string-chop "one two three" 4) ==> ("one " "two " "thre" "e") </enscript> === string-chomp <procedure>(string-chomp STRING [SUFFIX])</procedure> If {{STRING}} ends with {{SUFFIX}}, then this procedure returns a copy of its first argument with the suffix removed, otherwise returns {{STRING}} unchanged. {{SUFFIX}} defaults to {{"\n"}}. === string-compare3 <procedure>(string-compare3 STRING1 STRING2)</procedure><br> <procedure>(string-compare3-ci STRING1 STRING2)</procedure> Perform a three-way comparison between the {{STRING1}} and {{STRING2}}, returning either {{-1}} if {{STRING1}} is lexicographically less than {{STRING2}}, {{0}} if it is equal, or {{1}} if it s greater. {{string-compare3-ci}} performs a case-insensitive comparison. === string-intersperse <procedure>(string-intersperse LIST [STRING])</procedure> Returns a string that contains all strings in {{LIST}} concatenated together. {{STRING}} is placed between each concatenated string and defaults to {{" "}}. <enscript highlight=scheme> (string-intersperse '("one" "two") "three") </enscript> is equivalent to <enscript highlight=scheme> (apply string-append (intersperse '("one" "two") "three")) </enscript> === string-split <procedure>(string-split STRING [DELIMITER-STRING [KEEPEMPTY]])</procedure> Split string into substrings delimited by any of the characters given in the delimiter string. If no delimiters are specified, a string comprising the tab, newline and space characters is assumed. If the parameter {{KEEPEMPTY}} is given and not {{#f}}, then empty substrings are retained: <enscript highlight=scheme> (string-split "one two three") ==> ("one" "two" "three") (string-split "foo:bar::baz:" ":" #t) ==> ("foo" "bar" "" "baz" "") (string-split "foo:bar:baz,quux,zot" ":," ) ==> ("foo" "bar" "baz" "quux" "zot") </enscript> === string-translate <procedure>(string-translate STRING FROM [TO])</procedure> Returns a fresh copy of {{STRING}} with characters matching {{FROM}} translated to {{TO}}. If {{TO}} is omitted, then matching characters are removed. {{FROM}} and {{TO}} may be a character, a string or a list. If both {{FROM}} and {{TO}} are strings, then the character at the same position in {{TO}} as the matching character in {{FROM}} is substituted. === string-translate* <procedure>(string-translate* STRING SMAP)</procedure> Substitutes elements of {{STRING}} according to {{SMAP}}. {{SMAP}} should be an association-list where each element of the list is a pair of the form {{(MATCH . REPLACEMENT)}}. Every occurrence of the string {{MATCH}} in {{STRING}} will be replaced by the string {{REPLACEMENT}}: <enscript highlight=scheme> (string-translate* "<h1>this is a \"string\"</h1>" '(("<" . "&lt;") (">" . "&gt;") ("\"" . "&quot;")) ) => "&lt;h1&gt;this is a &quot;string&quot;&lt;/h1&gt;" </enscript> === substring=? <procedure>(substring=? STRING1 STRING2 [START1 [START2 [LENGTH]]])</procedure><br> <procedure>(substring-ci=? STRING1 STRING2 [START1 [START2 [LENGTH]]])</procedure> Returns {{#t}} if the strings {{STRING1}} and {{STRING2}} are equal, or {{#f}} otherwise. The comparison starts at the positions {{START1}} and {{START2}} (which default to 0), comparing {{LENGTH}} characters (which defaults to the minimum of the remaining length of both strings). === substring-index <procedure>(substring-index MAYBE-SUBSTRING STRING [START])</procedure><br> <procedure>(substring-index-ci MAYBE-SUBSTRING STRING [START])</procedure> Searches for first index in string {{STRING}} where string {{MAYBE-SUBSTRING}} occurs. If the optional argument {{START}} is given, then the search starts at that index. {{substring-index-ci}} is a case-insensitive version of {{substring-index}}. === reverse-list->string <procedure>(reverse-list->string LIST)</procedure> Returns a string with the characters in {{LIST}} in reverse order. This is equivalent to {{(list->string (reverse LIST))}}, but much more efficient. === reverse-string-append <procedure>(reverse-string-append LIST)</procedure> {{(apply string-append (reverse LIST))}} --- Previous: [[Module (chicken sort)]] Next: [[Module (chicken syntax)]] Description of your changes:

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