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.

Draft (hull)

The draft (American) or draught (British) of a ship's hull is the vertical distance between the waterline and the bottom of the hull (keel), with the thickness of the hull included; in the case of not being included the draft outline would be obtained. Draft determines the minimum depth of water a ship or boat can safely navigate. The draft can also be used to determine the weight of the cargo on board by calculating the total displacement of water and then using Archimedes' principle. A table made by the shipyard shows the water displacement for each draft. The density of the water (salt or fresh) and the content of the ship's bunkers has to be taken into account. The closely related term "trim" is defined as the difference between the forward and aft drafts.

Drafts of a ship

FEAT (album)

FEAT (pronounced "F-E-A-T") is the first studio album by Chicago-based record production duo The Hood Internet. It was released on Decon on October 2, 2012. The album features guest appearances from A.C. Newman, Cadence Weapon, and Class Actress, among others. Music videos were created for "Won't Fuck Us Over", "One for the Record Books", and "More Fun".

The remix album, FEAT Remixes, was released on December 18, 2012.

Reception

At Metacritic, which assigns a weighted average score out of 100 to reviews from mainstream critics, the album received an average score of 54% based on 6 reviews, indicating "mixed or average reviews".

Track listing

References

External links

Scratch (horse)

Scratch, also known as Scratch II (foaled 1947) was a French Thoroughbred racehorse and sire best known for winning the Prix du Jockey Club and the classic St Leger Stakes in 1950. Scratch won the Solario Stakes in England as a two-year-old and emerged as one of the best of a very strong generation of French-trained colts in the following year. He won the Prix de Guiche and Prix Greffulhe in the early part of the year and then defeated the year's outstanding three-year-old colt Tantieme in the Prix du Jockey Club. In the autumn of 1950 he won the St Leger by defeating Vieux Manoir, who had beaten him in the Grand Prix de Paris. He won the Prix Jean Prat as a four-year-old before being retired to stud where he had an unremarkable record as a sire of winners in Europe and South America.

Background

Scratch was a chestnut horse with a white star and a white sock on his right hind leg bred by his owner Marcel Boussac. He was sired by Pharis, the undefeated winner of the 1939 Grand Prix de Paris. Scratch's dam Orlamonde was an unsuccessful racehorse but produced several other winners including Damno, who won the Prix d'Arenberg. Orlamonde's dam Naic was a half sister of the Prix du Jockey Club winner Ramus and also produced the Grand Prix de Deauville winner Jock. Scratch was sent into training with Charles Semblat at Chantilly.

Scratch (programming language)

Scratch is a visual programming language. It is currently free. Scratch is used by students, scholars, teachers, and parents to easily create games and provide a stepping stone to the more advanced world of computer programming. It can also be used for a range of educational and entertainment constructionist purposes from math and science projects, including simulations and visualizations of experiments, recording lectures with animated presentations, to social sciences animated stories, and interactive art and music. Viewing the existing projects available on the Scratch website, or modifying and testing any modification without saving it requires no online registration.

Scratch allows users to use event-driven programming with multiple active objects called sprites. Sprites can be drawn, as vector or bitmap graphics, from scratch in a simple editor that is part of Scratch, or can be imported from external sources, including webcams.

As of 2013, Scratch 2 is available online and as an application for Windows, OS X, and Linux. The source code of Scratch 1.x is released under GPLv2 license and Scratch Source Code License.

Scratch (2010 film)

Scratch is a short film directed by Jakob Rørvik, and stars Viktoria Winge and Luke Treadaway.

Plot

Scratch follows Lena, an art student who is living in London. She searches for inspiration for her art project, and finds it in Sol. He is a scruffy young man who drifts around, engaging in seemingly detached relationships with a variety of people. Lena begins to follow Sol, gaining a voyeurs perspective on the young man's life, and taking pictures of him when while he is unaware. Things take a wrong turn when Sol discovers her. He is fascinated by her odd behaviour, and so Sol is now the one following her. The two form a strange relationship, gradually exposing each other's dreams, fears and lies.

Awards

In March 2010, Scratch won the Best Short Fiction award at the Aubagne Film Festival.

References

External links