Global Variables in Ruby

Global Variables in Ruby Global Variables are variables that may be accessed from anywhere in the program regardless of scope. Theyre denoted by beginning with a $ (dollar sign) character. However, the use of global variables is often considered un-Ruby, and you will rarely see them. Defining Global Variables Global variables are defined and used like any other variable. To define them, simply assign a value to them and begin using them. But, as their name suggests, assigning to global variables from any point in the program has global implications. The following program demonstrates this. The method will modify a global variable, and that will affect how the second method runs. $speed 10 def accelerate $speed 100 end def pass_speed_trap if $speed 65 # Give the program a speeding ticket end end accelerate pass_speed_trap Unpopular So why is this un-Ruby and why dont you see global variables very often? Put simply, it breaks encapsulation. If any one class or method can modify the state of the global variables at will with no interface layer, any other classes or methods that rely on that global variable may behave in an unexpected and undesirable manner. Further, such interactions can be very difficult to debug. What modified that global variable and when? Youll be looking through quite a lot of code to find what did it, and that could have been avoided by not breaking the rules of encapsulation. But thats not to say that global variables are never used in Ruby. There are a number of special global variables with single-character names (a-la Perl) that can be used throughout your program. They represent the state of the program itself, and do things like modify the record and field separators for all gets methods. Global Variables $0 - This variable, denoted by $0 (thats a zero), holds the name of the top-level script being executed. In other words, the script file that was run from the command line, not the script file that holds the currently executing code. So, if script1.rb was run from the command line, it would hold script1.rb. If this script requires script2.rb, $0 in that script file would also be script1.rb. The name $0 mirrors the naming convention used in UNIX shell scripting for the same purpose.$* - The command-line arguments in an array denoted by $* (dollar sign and asterisk). For example, if you were to run ./script.rb arg1 arg2, then $* would be equivalent to %w{ arg1 arg2 }. This is equivalent to the special ARGV array and has a less descriptive name, so it is rarely used.$$ - The interpreters process ID, denoted by $$ (two dollar signs). Knowing ones own process ID is often useful in daemon programs (which run in the background, unattached from any terminal) or system services. However, this gets a bit more complicated when threads are involved, so be wary of using it blindly. $/ and $\ - These are the input and output record separators. When you read objects using gets and print them using puts, it uses these to know when a complete record has been read, or what to print between multiple records. By default, these should be the newline character. But since these affect the behavior of all IO objects, theyre rarely used, if at all. You may see them in smaller scripts where breaking the encapsulation rules is not an issue.$? - The exit status of the last child process executed. Of all the variables listed here, this is probably the most useful. The reason for this is simple: you cant get the exit status of child processes by their return value from the system method, only true or false. If you must know the actual return value of the child process, you need to use this special global variable. Again, the name of this variable is taken from the UNIX shells.$_ - The last string read by gets. This variable may be a point of confusion for those coming to Ruby f rom Perl. In Perl, the $_ variable means something similar, but totally different. In Perl, $_ holds the value of the last statement and in Ruby it holds the string returned by the previous gets invocation. Their usage is similar, but what they really hold is very different. You dont often see this variable either (come to think of it, you rarely see any of these variables), but you may see them in very short Ruby programs that process text. In short, youll rarely see global variables. Theyre often bad form (and un-Ruby) and only really useful in very small scripts, where the full implication of their use can be fully appreciated. There are a few special global variables that can be used, but for the most part, they arent used. You dont really need to know all that much about global variables to understand most Ruby programs, but you should at least know that theyre there.

Captain Sir Henry Morgan - Biography

Captain Sir Henry Morgan - Biography Henry Morgan - Early Life: Little information exists regarding Henry Morgans early days. It is believed that he was born around 1635, in either Llanrhymny or Abergavenny, Wales and was the son of local squire Robert Morgan. Two principal stories exist to explain Morgans arrival in the New World. One states that he traveled to Barbados as an indentured servant and later joined the expedition of General Robert Venables and Admiral William Penn in 1655, to escape his service. The other details how Morgan was recruited by the Venables-Penn expedition at Plymouth in 1654. In either case, Morgan appears to have taken part in the failed attempt to conquer Hispaniola and the subsequent invasion of Jamaica. Electing to remain in Jamaica, he was soon joined by his uncle, Edward Morgan, who was appointed lieutenant-governor of the island after the restoration of King Charles II in 1660. After marrying his uncles eldest daughter, Mary Elizabeth, later that year, Henry Morgan began sailing in the buccaneer fleets that were employed by the English to attack Spanish settlements. In this new role, he served a captain in the fleet of Christopher Myngs in 1662-1663. Henry Morgan - Building Reputation: Having taken part in Myngs successful plundering of Santiago de Cuba and Campeche, Mexico, Morgan returned to sea in late 1663. Sailing with Captain John Morris and three other ships, Morgan looted the provincial capital of Villahermosa. Returning from their raid, they found that their ships had been captured by Spanish patrols. Unperturbed, they captured two Spanish ships and continued their cruise, sacking Trujillo and Granada before returning to Port Royal, Jamaica. In 1665,  Jamaican Governor Thomas Modyford Morgan appointed Morgan as vice-admiral of and expedition led by Edward Mansfield and tasked with capturing Curacao.   Once at sea, much of the expeditions leadership decided that Curacao was not a sufficiently lucrative target and instead set course for the Spanish islands of Providence and Santa Catalina.   The expedition captured the islands, but encountered problems when Mansfield was captured and killed by the Spanish. With their leader dead, the buccaneers elected Morgan their admiral. With this success, Modyford began sponsoring a number of Morgans cruises again the Spanish. In 1667, Modyford dispatched Morgan with ten ships and 500 men to free a number of English prisoners being held in Puerto Principe, Cuba. Landing, his men sacked the city but found little wealth as its inhabitants had been warned of their approach.   Freeing the prisoners, Morgan and his men re-embarked and sailing south to Panama in search of greater riches. Targeting Puerto Bello, a key Spanish center of trade, Morgan and his men came ashore and overwhelmed the garrison before occupying the town. After defeating a Spanish counterattack, he agreed to leave the town after receiving a large ransom. Though he had exceeded his commission, Morgan returned a hero and his exploits were glossed over by Modyford and the Admiralty. Sailing again in January 1669, Morgan descended on the Spanish Main with 900 men with the goal of attacking Cartagena. Later that month, his flagship, Oxford exploded, killing 300 men. With his forces reduced, Morgan felt he lacked the men to take Cartagena and turned east. Intending to strike Maracaibo, Venezuela, Morgans force was compelled to capture San Carlos de la Barra Fortress in order to move through the narrow channel approaching the city. Successful, they then attacked Maracaibo but found that the population had largely fled with their valuables.   After three weeks of searching for gold, he re-embarked his men before sailing south into Lake Maracaibo and occupying Gibraltar. Spending several weeks ashore, Morgan next sailed north, capturing three Spanish ships before re-entering the Caribbean. As in the past, he was chastised by Modyford upon his return, but not punished. Having established himself as the preeminent buccaneer leader in the Caribbean, Morgan was named commander-in-chief of all warships in Jamaica and given a blanket commission by Modyford to make war against the Spanish. Henry Morgan - Attack on Panama: Sailing south in late 1670, Morgan recaptured the island of Santa Catalina on December 15 and twelve days later occupied Chagres Castle in Panama. Advancing up the Chagres River with 1,000 men, he approached the city of Panama on January 18, 1671. Splitting his men into two groups, he ordered one to march through nearby woods to flank the Spanish as the other advanced across open ground. As the 1,500 defenders attacked Morgans exposed lines, the forces in the woods attacked routing the Spanish. Moving into the city, Morgan captured over 400,000 pieces of eight. During Morgans stay, the city was burned however the source of the fire is disputed. Returning to Chagres, Morgan was stunned to learn that peace had been declared between England and Spain. Upon reaching Jamaica, he found that Modyford had been recalled and that orders had been issued for his arrest. On August 4, 1672, Morgan was taken into custody and transported to England. At his trial he was able to prove that he had no knowledge of the treaty and was acquitted. In 1674, Morgan was knighted by King Charles and sent back to Jamaica as lieutenant governor. Henry Morgan - Later Life: Arriving in Jamaica, Morgan took up his post under Governor Lord Vaughan. Overseeing the islands defenses, Morgan also further developed his vast sugar plantations. In 1681, Morgan was replaced by his political rival, Sir Thomas Lynch, after falling out of favor with the king. Removed from the Jamaican Council by Lynch in 1683, Morgan was reinstated five years later after his friend Christopher Monck became governor. In declining health for several years, Morgan died on August 25, 1688, renowned as one of the most successful and ruthless privateers ever to sail the Caribbean. Selected Sources Cordingly, David. Under the Black Flag: The Romance and the Reality of Life Among the Pirates. New York: Random House, 2006Henry Morgan BiographyData Wales: Henry Morgan

Compare and contrast the values, institutions and actions of the Essay

Compare and contrast the values, institutions and actions of the city-states of Sparta and Athens - Essay Example Athenian citizens had enjoyed strong constitutional rights in political and legal aspects. This made them strong, materially and psychologically, which was envied by many non-citizens and these aspects were not compromised upon for anything else. At the Funeral Oration of Pericles, it was declared that the Greek Constitution was unique in its laws and is an example for others. It is meant for all people of the State and hence is democracy. The laws provide equal justice to all in their private differences; no form of discrimination is allowed based on social status or race and creed and not even by economic status. Any citizen serving the State will not be hindered by the obscurity of his position. This freedom extends from government to ordinary life (Butler, K; 18). Political organizations in Athens and the surrounding cities differed in specific instance conflict, as well as cooperation among groups. Athens was always in a better position than other States and tend to dictate to t he smaller states with which it was in league. Failure to meet Athenian expectations, whether reasonable or unreasonable, sometimes resulted in harsh treatment and other sorts of vindications announced. The impact of Greek concepts spread extensively through the Roman jurisprudence and philosophy, particularly the idea of ‘rights’ that the Greek government had announced. On the other side, Sparta was also admired by the Ancient World for different reasons. It was a military prowess and had a stable political system. Military, in Sparta, was different in that it was strengthened to cause repression of the majority of the internal population instead of defense against external aggression. This is treated as an early example of the conscious creation of state institutions for massive, ongoing repression of the kind Hobbes’ absolutist governor would have to have. Contrast to the Athenian ideology,

Success of the Communist Movement of the 1960's in Cuba and Not Research Paper

Success of the Communist Movement of the 1960's in Cuba and Not Bolivia - Research Paper Example Research demonstrates that Cuba was the third most developed country in the continent of America. Some aspects of development recorded in Cuba in 1950s surpassed European countries, such as Belgium, Spain, and Portugal. Cuba was not among the nations, which suffered from severe economic problems and reported lowest living standards of the citizens (Dolgoff). In contrast, Cuba was among the American countries that had the highest living standards before the revolution took off. Although Cuba was not a well developed nation economically and there was poverty in the country, Cuba did not face hunger as well as economic crises in the years prior to the revolution. Prior to the 1959, Cuba was reported to be relatively developed country. It was compared on economic standards of development to capitalist countries, such as Costa Rica besides Taiwan (Dolgoff). According to Eckistein (1982), at the time of revolution, Bolivia reported one of the poorest and least developed economies on the co ntinent. The GNP per capita of the country was the second lowest in South American region. The country was ruled by a small kin and land-based oligarchy. The majority of the citizens in Bolivia operated as tenant farmers as well as sharecroppers. In contrast, the Cuban economy was much developed and superior to the Bolivian economy. Cuba was one of the countries with a developed agricultural economy. Nonetheless, the heavily capitalized economy of the country was significantly dominated by foreign companies. Prior to the Cuban revolution, the agricultural economy of Cuba is reported to have been the most integrated economy in the global economy. The agricultural economy in Cuba increasingly used wage labor in the country. According to the Latin American... The Cuban revolution staged in 1959 by Fidel Castro was meant to liberate peasants and low class citizens from low standards of living and improve the economy of the country. The communist structures together with the overwhelming support of peasants from rural and urban regions ensured that the revolution was a success. Seven years later, Guevara Che, who actively participated in the Cuban revolution, set out to Bolivia to stage a revolt in the country that had similar economic problems to Cuba’s and enjoyed massive support of communism. However, 11 months later, he was captured, and killed and the revolution did not succeed as planned. There is a general misconception that poverty leads to communist uprisings and that accumulation of wealth do not contribute toward communism. This notion is misleading as demonstrated by the revolutions in Cuba and Bolivia in 1960s. Poverty does not lead to communism neither does wealth accumulation result in non-communism. Empirical data from various research materials will be reviewed to present the economic statistics and arguments indicating that before the Cuban revolution took place, Bolivia was more underdeveloped economically, yet communism did not thrive in the country as it did in Cuba, which was more developed. Subsequently, after the revolutions of which Cuba increasingly practiced communism but struggled with economic problems whereas Bolivia, which deviated toward non-communism progressively developed economically than Cuba. The political spheres, structure and organization of the communist parties in various countries, and the support of anticommunist nations contributed to the success or failure of the revolutions.

A Study On Elizabethan Love Sonnets

A Study On Elizabethan Love Sonnets Our anthology of Renaissance poetry focuses on the Elizabethan period and in particular the sonnet as a genre. Furthermore, we have focused on the theme of love as a dominant trend through the sonnets of this time as it will provide a familiar yet central introduction to the Renaissance period for first year college students. Under the parameters of the theme of the love sonnet we have chosen to concentrate on love as a tool for courtship, the poets attempt to immortalise his beloved through verse, love conquering depression and the link between love, sex and sexuality which is obvious in the Renaissance period. Using sonnets from Shakespeare, Sidney, Donne and Spenser, we aim to provide a clear rationale as to why the love sonnet really was representative of the Elizabethan era and of the English Literary Renaissance on a broader scale. Along with the advancement of Renaissance Italian poetry came the introduction of the love sonnet, a genre which developed through the English Literary Renaissance from Sidneys time and reached its peak with Shakespeare. â€Å"There are periods in the history of any literature when what poets need most is a formal convention which will enable them to study the demands of the medium quite objectively, with a craftsmans eye, and prevent them from merely splashing about in a language that has not been tempered to meet the precise curve of the meaning. The sonnet form met this need for English poets in the sixteenth century†. (Daiches, 1960, 150) Although the English Literary Renaissance developed further after the Elizabethan period, we feel that the sonnet is representative of Renaissance. The sonnet as a genre represents the development in the cultural in Elizabethan time spanning from ranging from Sidney to Shakespeare. Sir Philip Sidney first introduces the sonnet to Elizabethan England, demonstrating a strict adherence to the Petrarchan sonnet, both in form and content. This can be seen in the use of unrequited love in Sidneys collection of sonnets Astrophil and Stella continuing to the later stages of the Elizabethan era with Shakespeare and his interpretation of the sonnet, the Shakespearean sonnet. The difference mainly revolves around the poets ideas of love and how it should be defined. In Shakespeares Sonnet 130, the poet represents the shift from traditional views of the definition of idyllic love, where beauty is defined by a womans perfect outward beauty. â€Å"My mistress eyes are nothing like the sun; Coral is far more red than her lips red; If snow be white, why her breasts are dun† which is in direct conflict with the unrequited love or chivalri c love presented in the earlier Sidney sonnets. In this way it can be argued that Shakespeare represents the development of the sonnet over the span of the Elizabethan period and as such gives a great introductory insight into how love was treated in the Renaissance as a whole. Similarly, although Spensers Sonnet 54 does not flatter the object of his affection in the usual Renaissance manner, it is clear his love is for the woman is strong. A typical use of Elizabethan love sonnets is as a courting mechanism for the poet; a tool for which he can woo his beloved. While Sonnet 54 is unflattering on a surface level, Spenser connects with the object of his affection on a deeper level, a method which may have made a stronger impression on her. Another aspect of Elizabethan love sonnets is the poets attempt to immortalise his beloveds beauty and the love he had for the subject through verse. Edmund Spensers Sonnet 75 and Sonnet 79 are perfect examples of this. Sonnet 75 has a reflective, pensive tone as while it celebrates the beauty of his lover, it laments the transience of the human condition, something which is characteristic of Renaissance poetry. Similarly, Sonnet 79 is a celebration of the poets beloved, but unlike Sonnet 75, Spenser wants to immortalise her inner beauty. We felt that this was important as it is not representative of Elizabethan poetry, yet shows that the poets have the capacity to delve deeper than the celebration of physical beauty. Often we are presented with an image of the Elizabethan poet in a transitory state of depression which he knows will dissipate in time because his wife ultimately makes him the happiest in this world. Sonnet 34 by Spenser likens the poet to a ship lost at sea during a storm at the worst of times. â€Å"The Amoretti describes the growth of the poets love, moving from lust, the desire for possession of the beloved, to charity, the experience of the Not-self. The character of the lady in the sequence is static because her virtue is perfect from the beginning.† (Benson, 1972, 185) Shakespeares Sonnet 14 â€Å"In a period where gender identity is so crucial, where being a man (or woman) has such profound meanings, and where these roles were heavily discussed, it seems improbable that there was not a sense of sexual consciousness.† (Hattaway, 2000, 685) This improbability is confirmed by the love sonnets of William Shakespeare. Shakespeare sonnets can be split up into three different sections. Sonnets 1 126 are thought to have been addressed to a young male, whom in Shakespeares eyes has outstanding physical and intellectual attributes. Although requited love was a theme of Elizabethan love poetry, many poems have been dedicated to unrequited love. Sonnet 30 from Spensers Amoretti describes the struggle of a poet who courts a woman who is not in love with him. Using the familiar metaphor of fire and ice and how they are incompatible, he describes his heated fire-like affection and longing for the woman but cannot understand her cold, detached and ice-like distance from him. Spensers incredulousness at the way in which his courtship did not melt her cold heart is significant as it gives a modern audience an insight into Elizabethan love as a whole; women had more influence over who could court them than is perceived in modern culture. â€Å"Obviously enough, if we read the lady of the Amoretti as a type of Beatrice, all of the sonnets which emphasize her apparent cruelty are in fact fitting expressions of the appro-priate and necessary reaction of perfection to imperfection.† (Benson, 1972, 186) In this same w ay, Sidneys Sonnet 31 from Astrophil and Stella portrays exasperation with its subject for her lack of romantic interest. Had Stella paid attention to Astrophil by reading his sonnets dedicated to her, she would have realised the depth of his love for her and in due course returned it. Furthermore, this poem gives us a wonderful example of chivalric love and courtship that is typical of the Elizabethan age. â€Å"Physical union alone did not lead to this new form just as lust did not lead to virtuous love. Only from the latter-a love which was constant and true came the union of souls towards which the love of rational creatures was supposed to strive.† (Cirillo, 1969, 84) Bibliography Cirillo, A. C., The Fair Hermaphrodite: Love-Union in the Poetry of Donne and Spenser, 1969

Business Intelligence and Data Warehousing as a Solution Essay

As it is anticipated that there is a fundamental objective of the company to reduce costs, make informed decisions and consolidate information, there is urgent need to for resilient development of the business intelligence and data warehousing (Collier, 2012). The poor response by IT in the provision of strategic information indicates that the system is incapable of guiding the company to success. This is a potential threat to the prosperity of the business, and hence a quicker intervention is required to ensure success is attained. Business Intelligence and Data Warehousing as a Solution The implementation of BI and DWH services in the sales department would ensure a sustained growth and a competitive edge to the company. Integration of business intelligence would cover the use of information necessary to drive the organization insight. Operational business intelligence would produce an improved analysis of sales data and provide in-depth knowledge of the performance indicators of the marketing department such as the customers of the company, competitors, economic environment and internal operations that would in turn help in making efficient and best quality sales and marketing decisions (Collier, 2012). Also, the concept of data warehousing would enable a central integration and management of sales and marketing database containing data from the four operational sources in the department from heterogeneous sources. The created database would contain structured sales data for query analysis and can be accessed by all the authorized users. The good news reads that th e data warehouse can be created and updated at any time, with limited disruption of the operational systems (Simon, 2014). There is a broad set of technologies, applications and knowledge for gathering and analyzing sales data for the purpose of helping users make sales and marketing decisions. Issues Needed to be Addressed There is need to integrate BI and DWH applications in the operational systems as there is a significant requirement of current data for the purposes of sales. These tools are critical in supporting the sales and marketing decision makers in the organization. However, without proper governance, it would a long-awaited dream to achieve the value offered by BI and DWH. As such, there is urgent need to develop BI/DWH governance framework in the sales and marketing department based on universal principles and clear information ownership and dissemination. Essentially, there is a need for designing, implementing and making effective use of BI tools to achieve marketing objectives and increase revenue returns. Summary Making the most of the company’s data assets is the purpose of BI at a high level. The company would increase its competitive advantage such as reducing costs, increasing investment returns, reducing risks by making best data-driven decisions through a structured BI. Therefore, we can begin by developing the governance framework through designing, executing, monitoring and controlling and implementing to enhance proper management of the company sales data. References Collier, K. (2012). Agile analytics: A value-driven approach to business intelligence and data warehousing. Upper Saddle River, NJ: Addison-Wesley. Simon, A. R. (2014). Enterprise business intelligence and data warehousing: Program management essentials. Source document

Cost of the Death Penalty Essay - 1190 Words

Costs and Consequences of the Death Penalty, written by Mark Costanzo, neatly lists reasons for opposition, and abolishment of, the death penalty. Costanzo provides a review of the history of the death penalty, a review of how the death penalty process is working today, questions on whether or not if the death penalty is inhumane and cheaper than life imprisonment. He also questions if the death penalty is fairly applied and the impact, if any, that it has on deterrence. He closely examines the publics support of the death penalty and questions the morality of the death penalty. Finally, Costanzo provides his own resolution and alternative to the death penalty. Each of these items allows the reader an easy, and once again, neat view†¦show more content†¦With the process at this point, there was no way of knowing why juries were choosing death in one case, yet choosing life in others. Also, blacks were being killed at a much higher rate that any other offender. These two reas ons, long with others, led the high court to claim the death penalty unconstitutional until further revamping, which was soon to come. The second major decision from the Supreme Court was in the Gregg v. Georgia case. Here the court approved a series of reforms intended to eliminate arbitrary and discriminatory death sentences and established the two-phase system for the death penalty. The first phase is the quot;guilt phasequot; which is conducted on its own to find guilt or acquittal, without the job of issuing punishment. The second phase is the quot;penalty phasequot;. Here the same jury decides if the defendant is to live or be given the death sentence. Each phase allows the jury to focus on one task, instead of letting death sway their decision on guilt. This bifurcated jury system is in place today. 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