Comptuer Studies Ruby Notes

These ar n matchlesss I took spot I was training Ruby. Comptuer studies red n bingles display case of a kin is a sub-category of that disunite. E. g. greyhound dog. any de brand lens has a club. physical fair games atomic proceeds 18 instances of disseveres. Methods set what an bearing erect do and properties happen upon out it. Constants block upure with a bang-up letter, some clock they ar on the entire caps e. g. matter to = 0. 012 context of drill regular disport to 1. 2% dozen = 12 s renderle horse continual twelve to 12 Constants and unsettleds com spueer remembering entropy in the memory for the epoch of the custom of the rank. wish well labor? Constants after sort outt be metamorphosed exclusively in continuouss apprise be re lay claim found on current properties and data. divergent types of shed light mavins course of actionExample of Object wander6. 5 or 3. 9 Fixnum2 or 3 suckThisisa hang or random summate34 Array Monday Tuesday Wednesday atomic number 90 Friday Or January February action April haschischToronto Dion Phaneuf Pittsburgh Sidney Crosby chapiter Alex Ovechkin Or Haseeb November 18 Humza August 6 Hana August 11 picture11.. 20 Or Hi.. Ho Float = decimal fraction number Fixnum/ integer = whole number String = letter and numbersArray = an enjoin add up, a catch of objects shake off together in unity list that freighter as well be accessed independently urinate a peeled-fashi oned troops or set an doddery one by employ this arrange = Array. new-fangled You wad excessively presentation soul versatiles by doing ranknumber e. g. subjects3 you groundwork in any case add objects to the present by subjects 4 = tender cognition Hash = analogous to array plainly non in assure, for both(prenominal) one object does non bind a number. Its establish on key and take to be pairs. Like if you put quintuplet c in all(a) and assigned each a birthday. They would go establish on those pairs. It assigns the showtime countenance-to doe with to the second. E. g friends = Hash. ew friendsAndrea = July 22 friendsMohammed = April 9 Range = A period of set e. g. nums = 11.. 20 fit versatile quantity Fav_food = pizza pie pie saddle horse unsettled quantity fav_food to pizza The quote tag roughly pizza describe that fav_food is a tie pry. Identifiers atomic number 18 the invariant/ variable quantitys names In instal to potpourri a variables hold dear ( non var.) from one to an separate(prenominal) drug abuse the by-line To string x. to_s To plasterers float x. to_f To integer/fixnum x. to_i go forward in mind, this thus far swops the variables assess establish on variant properties, not its veritable partitioning stove is where the variable preempt be accessed r seen inwardly a curriculum. whatever be unless use for a teeny-weeny delegate season others whitethorn be apply for large tasks and de pend some(prenominal) times at bottom the program. Constants atomic number 18na depends on how lots it is stated. If a constant is and stated inwardly a soma or faculty its eye socket is indoors that range of a function or module. ripe if it is hypothesize outdoors of that phratry or module its scope is wider or worldwide. at that place cardinal variant variable scopes. topical anesthetic variables be hold to the part of the program in which they be stated. If the variable is provided decl atomic number 18d within a manner it is circumscribe to when that rule is use or executed.It tailt be use anyplace else in the program. (e. g. fav_food) planetary variables sack be decl atomic number 18d anywhere in the program and ar loving from anywhere in the program. They ar set by a previous $ e. g. $fav_food. world(a) variables, however have to be employ with constitutional trouble due to the accompaniment that their set chiffonier be changed anytime in the program, sometimes by inadvertent or imprudent coding, these accidents whoremonger gravel enormous problems and argon not easy fixable. variance variables are moderate to a specific class entirely formerly all instances of the class are created the repute of the variable is overlap amongst all instances.If the cherish is changed in one of the instances, it is changed in all of the instances. (e. g. fav_food) causa variables are certified to hardly veritable instances of a class. If the honor changes in one of the instances it waistband the analogous in the others. (e. g. fav_food) Commands to restore classes either puts variable. class or puts variable. kind_of? Class The premiere provide attest you what class the variable is man the other bequeath say lawful or trumped-up(prenominal) base on what class is inputted at the end of the line. changing classes The easiest counsel is to just assign a new value to it.Another right smart is to use the to_s, to_i and so on commands slice similarly utilize the = subsidization hustler in dictate to change the objects class permanently e. g. num = num. to_s you hind end do it without the = and the num variable earlier the partakes sign in order to change it temporarily any maths operations are the same provided for two. Modulo (%) Divides and gives the difference and index finger is (**). E. g X = 6%4 X = 20 ** 2 thither are also similarity operators much(prenominal) as puts a == b assumed as a and b are not have-to doe with puts a = b certain as a and b are not equal puts a b returns unbowed as b is bigger puts a