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 (sewing)

Trim or trimming in clothing and home decorating is applied ornament, such as gimp, passementerie, ribbon, ruffles, or, as a verb, to apply such ornament.

Before the industrial revolution, all trim was made and applied by hand, thus making heavily trimmed furnishings and garments expensive and high-status. Machine-woven trims and sewing machines put these dense trimmings within the reach of even modest dressmakers and home sewers, and an abundance of trimming is a characteristic of mid-Victorian fashion. As a predictable reaction, high fashion came to emphasize exquisiteness of cut and construction over denseness of trimming, and applied trim became a signifier of mass-produced clothing by the 1930s. The iconic braid and gold button trim of the Chanel suit are a notable survival of trim in high fashion.

In home decorating, the 1980s and 1990s saw a fashion for dense, elaborately layered trimmings on upholstered furniture and drapery.

Today, most trimmings are commercially manufactured. Scalamandré is known for elaborate trim for home furnishings, and Wrights is a leading manufacturer of trim for home sewing and crafts. Trims are used generally to enhance the beauty of the garments. It attracts buyers. Appropriate use of it creates more value of the product.

Untitled (Selections from 12)

Untitled (Selections From 12) is a 1997 promotional-only EP from German band The Notwist which was released exclusively in the United States. Though the release of the EP was primarily to promote the band's then-current album 12, it contains one track from their 1992 second record Nook as well as the non-album cover of Robert Palmer's "Johnny and Mary". The version of "Torture Day" on this EP features the vocals of Cindy Dall.

Track listing

Untitled (West)

Untitled is an outdoor 1977 stainless steel sculpture by American artist Bruce West, installed in Portland, Oregon, in the United States.

Description

Bruce West's Untitled is installed along Southwest 6th Avenue between Washington and Stark streets in Portland's Transit Mall. It was one of eleven works chosen in 1977 to make the corridor "more people oriented and attractive" as part of the Portland Transit Mall Art Project. The stainless steel sculptures is 7 feet (2.1 m) tall. It was funded by TriMet and the United States Department of Transportation, and is administered by the Regional Arts & Culture Council.

See also

References

External links

Untitled (Kelly, 1975)

Untitled is an outdoor 1975 sculpture by Lee Kelly, installed at Louisa Boren Park in Seattle, Washington, in the United States. The abstract, welded Cor-Ten steel piece measures approximately 19 feet (5.8 m) x 14 feet (4.3 m) x 10 feet (3.0 m). It was surveyed and deemed "treatment needed" by the Smithsonian Institution's "Save Outdoor Sculpture!" program in November 1994. The work is part of the Seattle One Percent for Art Collection and administered by the Seattle Arts Commission.

References

Further reading