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Without a doubt, Adaptive Path is a true leader in the Web design space and undoubtedly will have more to say on the topic of Ajax If you haven t heard of Rails or Ruby yet, head over to wwwrubyonrailsorg/ and wwwruby-langorg/en/ Rails is an open-source Web framework that was developed by David Heinemeier Hansson of 37signals while working on the project management tool Basecamp, and it s written in the object-oriented scripting language Ruby Proving that all good frameworks are extracted from living applications, Rails incorporates a number of fascinating features What draws many to Rails is its convention-over-configuration approach along with its built-in ability to generate the basic scaffolding of a typical application that has a Web front end for a relational database, which seems to be all the rage these days.

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Closely related to casting is the idea of type tests. An identifier can be bound to an object of a derived type, as you did earlier when you bound a string to an identifier of type obj: #light let anotherObject = ("This is a string" :> obj) Since an identifier can be bound to an object of a derived type, it is often useful to be able to test what this type is. To do this, F# provides a type test operator, which consists of a colon followed by a question mark (: ). To compile, the operator and its operands must be surrounded by parentheses. If the identifier in the type test is of the specified type or a type derived from it, the operator will return true; otherwise, it will return false. The next example shows two type tests, one that will return true and the other false: #light let anotherObject = ("This is a string" :> obj) if (anotherObject print_endline else print_endline if (anotherObject print_endline else print_endline : string) then "This object is a string" "This object is not a string" : string[]) then "This object is a string array" "This object is not a string array"

The worm gear advances the 24-tooth gear by only 1 tooth per motor revolution. The turntable has 56 teeth, so the 8-tooth gear makes 7 revolutions for 1 turntable rotation, and 7 times 24 equals 168. That works out to only 2.2 degrees per turn. If you turn the motor 16 times, the camera will move 35 degrees, allowing plenty of overlap between shots. Repeating this 11 times will create a pan of more than 380 degrees.

First you create an identifier, anotherObject, of type obj but bind it to a string. Then you test whether the anotherObject is a string, which will return true. Then you test whether it is a string array, which will, of course, return false.

Several people have reported productivity gains using Ruby on Rails that are frankly staggering, and by following any of several tutorials at this site you can have an application up and running in mere minutes1 What makes Rails interesting in the context of this book is its amazing support for Ajax right out of the box Rails includes libraries to handle drag-and-drop actions along with other common Ajax approaches, and helper packages exist to ease the burden of performing tasks such as using autocomplete, calling the server, and submitting a form in the background It s no surprise that Rails has such great support for Ajax several of the original applications built with it are shining examples of what can be done with Ajax Take a look at Basecamp, Backpack, and Ta-da List to get some inspiration for your next application.

As shown in 3, type annotations are a way of constraining an identifier, usually a parameter of a function, to be a certain type. What may seem counterintuitive to an OO programmer is that the form of type annotation introduced in 3 is rigid; in other words, it does not take into account the inheritance hierarchy. This means that if such a type annotation is applied to an expression, then that expression must have precisely that type statically; a derived type will not fit in its place. To illustrate this point, consider the following example: