Trimming (computer programming): Difference between revisions

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Latest revision as of 10:53, 8 April 2025

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===Left or right trimming===

The most popular variants of the trim function strip only the beginning or end of the string. Typically named '''ltrim''' and '''rtrim''' respectively, or in the case of Python: '''lstrip''' and '''rstrip'''<ref>IOFLOOD Python Strip[https://ioflood.com/blog/python-strip/#Exploring_Alternatives_lstrip_and_rstrip_Methods]</ref>. C# uses '''TrimStart''' and '''TrimEnd''', and Common Lisp '''string-left-trim''' and '''string-right-trim'''. Pascal and Java do not have these variants built-in, although [[Object Pascal]] (Delphi) has '''TrimLeft''' and '''TrimRight''' functions.<ref>{{cite web|url=httphttps://www.freepascal.org/docs-html/rtl/sysutils/trim.html |title=Trim |publisher=Freepascal.org |date=2013-02-02 |access-date=2013-08-24}}</ref>

===Whitespace character list parameterization===

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The characters which are considered whitespace varies between programming languages and implementations. For example, C traditionally only counts space, tab, line feed, and carriage return characters, while languages which support [[Unicode]] typically include all Unicode space characters. Some implementations also include [[ASCII]] control codes (non-printing characters) along with whitespace characters.

Java's trim method considers ASCII spaces and control codes as whitespace, contrasting with the Java <code>isWhitespace()</code> method,<ref>{{cite web|url=httphttps://java.sun.com/j2se/1.5.0/docs/api/java/lang/Character.html#isWhitespace(char) |title=Character (Java 2 Platform SE 5.0) |publisher=Java.sun.com |access-date=2013-08-24}}</ref> which recognizes all Unicode space characters.

Delphi's Trim function considers characters U+0000 (NULL) through U+0020 (SPACE) to be whitespace.

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==External links==

*[httphttps://www.tcl.tk/man/tcl8.4/TclCmd/string.htm#M46 Tcl: string trim]

*[httphttps://blog.stevenlevithan.com/archives/faster-trim-javascript Faster JavaScript Trim] - compares various JavaScript trim implementations

*[http://webwidetutor.com/php/PHP-Change-String-value-behaviour-or-look-?id=8 php string cut and trimming]- php string cut and trimming