Trimming (computer programming)

In computer programming, trimming (trim) or stripping (strip) is a string manipulation in which leading and trailing whitespace is removed from a string.

For example, the string (enclosed by apostrophes)

would be changed, after trimming, to

Variants

Definition of whitespace

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 isWhitespace() method, which recognizes all Unicode space characters.

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

Usage

Following are examples of trimming a string using several programming languages. All of the implementations shown return a new string and do not alter the original variable.

Trim (computing)

A Trim command (known as TRIM in the ATA command set, and UNMAP in the SCSI command set) allows an operating system to inform a solid-state drive (SSD) which blocks of data are no longer considered in use and can be wiped internally.

Trim was introduced soon after SSDs were introduced. Because low-level operation of SSDs differs significantly from hard drives, the typical way in which operating systems handle operations like deletes and formats resulted in unanticipated progressive performance degradation of write operations on SSDs. Trimming enables the SSD to handle garbage collection overhead, which would otherwise significantly slow down future write operations to the involved blocks, in advance.

Although tools to "reset" some drives to a fresh state were already available before the introduction of trimming, they also delete all data on the drive, which makes them impractical to use for ongoing optimization. By 2014 many SSDs had internal idle/background garbage collection mechanisms that work independently of trimming; although this successfully maintains their performance even under operating systems that do not support Trim, it has the associated drawbacks of increased write amplification and wear of the flash cells.

Trim (rapper)

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Trim, born Javan St. Prix (18 April 1984) and formerly known as Taliban Trim is an English grime MC from East London and a former member of Roll Deep. He is a cousin of Roll Deep member DJ Karnage, former Roll Deep member Roachee, footballer Leon Knight and grime MC Lee Brasco. Despite limited commercial success, Trim has won much praise and a cult following for his eclectic subject matter, beat selection and delivery.

2003-2006: Roll Deep

Trim joined Roll Deep in 2003 and immediately began recording music with the collective. Trim was featured on Roll Deep's Creeper Vol. 1 and Creeper Vol. 2 before being featured on the highly successful debut album In At The Deep End, contributing to hits such as When I'm Ere and Heat Up. Trim then began working on Roll Deep's second album Rules and Regulations in 2006 but left the group by the time it was released in 2007, after a disagreement with fellow MC Flowdan. In 2011 Trim spoke to Huw Stephens about how leaving Roll Deep helped him find his own musical direction and stand on his own as an artist.