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Ruby is an open source, object-oriented programming language created and maintained by Yukihiro Matsumoto (among others). Languages such as Perl, LISP, Smalltalk, and Python have inspired the syntax and styling of the language. It is cross platform and runs on several different architectures, although its home architecture is Linux on x86. Among other things, Ruby has automatic garbage collection, is easily portable, supports cooperative multitasking on all supported platforms using its own threading system, has a large standard library, and supports most features associated with dynamic languages (such as closures, iterators, exceptions, overloading, and reflection). Ruby is an interpreted language. This is in opposition to languages that are compiled. Code developed in languages such as C and C++ has to be compiled into object code that represents instructions supported by a computer s processor. Ruby, however, is compiled

Returns the element matching the given ID article_123 Returns a list of elements with the class name comment Returns a list of div elements with the class name article

down into platform-independent bytecode that is run by a virtual machine. Python, Java, and C# share this characteristic, although they all run upon different virtual machine implementations and have different execution characteristics. Table A-1 highlights some key differences between several popular programming languages. Table A-1. Feature Comparison Between Several Popular Programming Languages

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It makes sense to find people who you can trust to take care of the things that aren t within your area of expertise For instance, you don t memorize tax codes or build CPUs for your computers Instead, you hire an accountant and pay Intel for those chips Knowing how to deploy is very useful But when you re launching an important product into production mode, you should go with the best You can find several relatively cheap Rails hosts out there If you re going toward production with an important project, do not use them The reason they are cheap is because they are cheap You will be disappointed Trust us we learned the hard way If you re going to spend hundreds of hours of your life building something that you hope will make you some money, you ll want to host it properly.

Ruby has been developed with the principle of least surprise in mind, so the way you d expect things to work is usually a valid way of doing something. This means Ruby is very much a there s more than one way to do it type of language, in the same vein as Perl but quite different in philosophy from languages such as Python, where having one clear process to achieve something is seen as the best way to do things.

No matter how genius the application is, if people can t access it due to downtime, that application won t be getting rave reviews We recommend two services: Slingshot Hosting (http://slingshothostingcom): Slingshot is run by a group of very intelligent Rails developers, including Charles Brian Quinn (CBQ), one of the world s foremost experts on Rails deployment Slingshot has prewritten and preconfigured scripts that you can use to deploy your application with Capistrano Slingshot provides dedicated, preconfigured boxes and fantastic support You simply drop their Capsitrano recipe into your application, fire off a few commands from the terminal, and your application is ready for the wild Engine Yard (http://engineyardcom): Like Slingshot, Engine Yard also provides you with a simple set of Capistrano scripts that make deployment a breeze Ezra Zygmuntowicz is Engine Yard s primary developer and is a legend in the Rails deployment community.

Note A useful resource is the official Ruby site s Ruby From Other Languages section at http:// www.ruby-lang.org/en/documentation/ruby-from-other-languages/, where in-depth comparisons

$('.comment')

One important concept in Ruby is that almost everything is an object. For example, the following line of code calls a primitive, internal method called puts with a single argument of 10. puts prints its arguments to the screen: puts 10

Instead of focusing on dedicated boxes, Engine Yard has a scalable deployment system made up of slices Basically, this means that you can quickly scale your application with very little effort The service takes care of the details of building a cluster of slices Engine Yard is more expensive than Slingshot, but its scalability factor may be worth the difference if you plan on becoming the next Digg..

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