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Download Agile Web Development with Rails (4th edition) by Dave Thomas, David Heinemeier Hansson, Sam Ruby PDF

By Dave Thomas, David Heinemeier Hansson, Sam Ruby

Ruby on Rails is helping you produce top of the range, beautiful-looking net purposes quick. you think about growing the applying, and Rails looks after the details.

Tens of hundreds of thousands of builders have used this award-winning publication to profit Rails. It's a large, far-reaching instructional and reference that's prompt by means of the Rails middle group. If you're new to Rails, you'll get step by step counsel. If you're an skilled developer, this booklet offers you the great, insider details you need.

Rails has developed through the years, and this booklet has advanced in addition to it. We nonetheless begin with a step by step walkthrough of creating a true program, and in-depth chapters examine the integrated Rails gains. This version now supplies new Ruby and Rails clients additional info at the Ruby language and takes extra time to give an explanation for key techniques all through. most sensible practices on easy methods to observe Rails proceed to alter, and this variation retains up. Examples use cookie sponsored classes, HTTP authentication, and lively Record-based types, and the e-book focuses all through at the correct approach to use Rails. also, this variation now displays Ruby 1.9, a brand new unencumber of Ruby with great useful and function improvements.

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Additional resources for Agile Web Development with Rails (4th edition)

Example text

With arrays, the key is an integer, whereas hashes support any object as a key. Both arrays and hashes grow as needed to hold new elements. It’s more efficient to access array elements, but hashes provide more flexibility. Any particular array or hash can hold objects of differing types; you can have an array containing an integer, a string, and a floating-point number, for example. You can create and initialize a new array object using an array literal—a set of elements between square brackets.

Instead, you simply finish the body with the keyword end. The keyword return is optional, and if not present, the results of the last expression evaluated will be returned. 2 Data Types While everything in Ruby is an object, some of the data types in Ruby have special syntax support, in particular for defining literal values. In these examples, we’ve used some simple strings and even string concatenation. Strings This previous example also showed some Ruby string objects. One way to create a string object is to use string literals, which are sequences of characters between single or double quotation marks.

You should see it display our friendly greeting. 0 printing, October 28, 2010) 41 H ELLO , R AILS ! 3: Standard locations for controllers and views In total, we’ve looked at two files in our Rails application tree. We looked at the controller and we modified a template to display a page in the browser. These files live in standard locations in the Rails hierarchy: controllers go into app/controllers, and views go into subdirectories of app/views. 3. Making It Dynamic So far, our Rails application is pretty boring—it just displays a static page.

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