Zipper (data structure)

A zipper is a technique of representing an aggregate data structure so that it is convenient for writing programs that traverse the structure arbitrarily and update its contents, especially in purely functional programming languages. The zipper was described by Gérard Huet in 1997. It includes and generalizes the gap buffer technique sometimes used with arrays.

The zipper technique is general in the sense that it can be adapted to lists, trees, and other recursively defined data structures. Such modified data structures are usually referred to as "a tree with zipper" or "a list with zipper" to emphasize that the structure is conceptually a tree or list, while the zipper is a detail of the implementation.

A layman's explanation for a tree with zipper would be an ordinary computer filesystem with operations to go to parent (often cd ..), and the possibility to go downwards (cd subdirectory). The zipper is the pointer to the current path. Behind the scenes the zippers are efficient when making (functional) changes to a data structure, where a new, slightly changed, data structure is returned from an edit operation (instead of making a change in the current data structure).

Zipper (film)

Zipper is a 2015 political thriller film, written and directed by Mora Stephens, starring Patrick Wilson, Lena Headey, Dianna Agron, Richard Dreyfuss, Ray Winstone, and Penelope Mitchell. The film had its world premiere on January 27, 2015 at the Sundance Film Festival. The film was released on August 28, 2015, in a limited release in the United States and through video on demand by Alchemy. The film follows a federal prosecutor running for office who cannot stop himself from sleeping with high-class escorts, putting both his career and his personal life at risk.

Plot

Sam Ellis (Patrick Wilson) is a man on the rise – a hot-shot prosecutor on the cusp of a bright future. When an intern (Dianna Agron) at the office becomes infatuated with him, Sam unwisely attempts to quiet his desires by seeing a high class escort — only to discover that the experience is more fulfilling and exhilarating than he could have imagined. A second appointment with an escort soon follows, and a third, sending his once idyllic life spiraling out of control. In the midst of wrestling with his demons, he suddenly finds himself being groomed to run for Attorney General — thrusting him into the public spotlight, and forcing him to take increasingly dangerous measures to keep the press, the law and his wife (Lena Headey) off his trail.

Zipper (BDSM)

In BDSM terms, a zipper is a string of clothespins or other clips, held together loosely by a cord or light chain.

The skin is clipped in the clips for a short time, then the cord is pulled, causing the clips to be pulled off the skin one by one in sequence causing a "zip" sound, and a unique sensation. Zippers come in many sizes and with varied numbers of clips. They are a very popular home-made BDSM toy. A zipper can also be created with temporary piercing needles. Zippers are commonly incorporated in predicament bondage.

External links

Version

Version may refer to:

Computing

Music

Albums

Other uses

See also

Version (album)

Version is the second album by New York-based English producer Mark Ronson. It is an album of cover versions with a retro-inspired sound, which Mark Ronson describes as "Motown/Stax".Version was released on 14 June 2007 in the iTunes Store, and it entered the UK Album Chart at number two on 22 June 2007.

The album reached number 2 on the UK Albums Chart and has sold 105,584 copies as of January 2015.

About

Released in mid-2007, the album charted in the Billboard 200 and debuted at number 2 in the UK, supported by the success of single "Stop Me", which charted at number 2 in the UK, top 5 of the US Dance charts, and in the top 40 of Italy and Australia. Upon its release, the album managed to crack into the World Top 40, charting at 29.

Ronson's next single, "Oh My God" with Lily Allen, became his second top 10 single, peaking at 8 in the UK. "Valerie", Ronson's third single, also peaked at number 2 in the British charts, kept out of the top spot by the Sugababes. It has spent a dozen weeks in the top 10 and has sold well over 300,000 copies. The song ended the year as the ninth biggest seller, behind number 1's "Bleeding Love", "Umbrella", "Grace Kelly" among others. "Valerie" also charted in the Switzerland and New Zealand charts and even managed to top the Dutch Top 40 for four consecutive weeks, keeping Leona Lewis from the top spot.

Eye movement

Eye movement refers to the voluntary or involuntary movement of the eyes, helping in acquiring, fixating and tracking visual stimuli. Specific systems are used in maintaining fixation, when reading and in music reading. A special type of eye movement, rapid eye movement, occurs during REM sleep.

The eyes are the visual organs of the human body, and move using a system of six muscles. The retina, a specialised type of tissue containing photoreceptors, senses light. These specialised cells convert light into electrochemical signals. These signals travel along the optic nerve fibers to the brain, where they are interpreted as vision in the visual cortex.

Primates and many other vertebrates use three types of voluntary eye movement to track objects of interest: smooth pursuit, vergence shifts and saccades. These movements appear to be initiated by a small cortical region in the brain's frontal lobe. This is corroborated by removal of the frontal lobe. In this case, the reflexes (such as reflex shifting the eyes to a moving light) are intact, though the voluntary control is obliterated.