Building Dynamic Web 2.0 Websites with Ruby on Rails by A P Rajshekhar

By A P Rajshekhar

Learn how to create dynamic web content with Ruby on Rails. This booklet is for a person who has easy thoughts of object-oriented programming in addition to relational databases and desires to increase on-line purposes utilizing Ruby on Rails. past wisdom of Ruby or Rails isn't anticipated.

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That completes the fast track introduction to the basic concepts of Ruby. Next, let us see how RoR builds itself on Ruby. The # is an interesting character. When used outside single or double quotes, the line following it is treated as a comment. However, inside single or double quotes, it is treated as a value replacement. RoR—Concepts and Components Now that the basics of Ruby have been introduced, let us move on to the next stage—RoR. ', the most common answer will be, 'RoR is a Ruby-based framework that implements the MVC pattern'.

The block arguments are surrounded by pipe characters and separated by comma. times{|msg| print msg } Use of blocks will become clearer when we discuss iterators, and that is coming up next. Iterators Iterators do what their name suggests—they iterate over a collection. Iteration can be done using the each keyword. each {|| } Here, can be an array or a list of any kind and var is the variable. 4 foo >Exit code: 0 So how do blocks and iterators help in more common contexts such as reading and writing to a file?

Loops also come under anonymous blocks. An example of anonymous block can be opening a file. times{ print "Hello \n" } Blocks can have arguments too. In other words, they can work like a slimmed down version of methods. Throughout this chapter, I will be using methods and functions interchangeably. The block arguments are surrounded by pipe characters and separated by comma. times{|msg| print msg } Use of blocks will become clearer when we discuss iterators, and that is coming up next. Iterators Iterators do what their name suggests—they iterate over a collection.

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