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The latest version of Prototype also features a double dollar function ($$) for using CSS selectors to retrieve an array of elements. Here s a great example of how easy it can be used to create an expand and collapse feature for an FAQ page: <div class="question">What is an apple </div> <div class="answer">It's a fruit!</div> $$('.question').each(function(el){ Event.observe(el , 'click', (function(){ this.next().toggle() }).bindAsEventListener(el)); }); There s a bunch of things happening in this example. First is the $$() function, which retrieves any element on the page with a class name of question. This function returns an array of elements. Because it is an array, you can now use the Array.each() method that the Prototype library makes available to you. It takes a function as its sole parameter, executing it for each element in the array, with the element getting passed into that function. Within that anonymous function, a click event handler is attached to each element. The element is bound as the event listener to access it from within the event handler by using the this keyword. When a user clicks a question, the function will grab the next element and toggle its visibility. With this level of succinctness, you can lose readability. There are ways to write the code to make it easier to read, but it s often at the cost of brevity. Here s a quick example that uses named functions instead of anonymous functions to improve readability: function onEach(el) { function toggle() { this.next().toggle(); } Event.observe(el, 'click', toggle.bindAsEventListener(el)); } $$('.question').each( onEach ); Prototype s approach to object-oriented design is firmly in the object literal camp. A constructor can be created by specifying an initializing function: <input type="text" id="searchfield" value="Search"> <script type="text/javascript"> var FormField = Class.create(); FormField.prototype = { initialize: function(id) { var el = $(id); Event.observe(el,'focus',(function()

Instructs the persistence provider to store the sequence name and its current value in a table in the underlying database, increasing the current value each time a new instance of the annotated entity is persisted. Can be used if your underlying database supports sequences. The persistence provider will utilize the sequence specified, which you must have created in the database.

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Map/reduce is a concept in software that has recently gained popularity in distributed computing. The concept is based on two functions map and reduce both of which are intended to be used with a list of inputs. The map function produces an output for each item in this list, while the reduce function produces a single output for the entire list. CouchDB exploits the characteristics of these two functions to provide incremental calculation of views. This means that each time a document is updated in a CouchDB database, only those documents that have been modified need to be reprocessed by the map and reduce functions. Google use an implementation of map/reduce in its web index. Google has thousands of machines working on hundreds of terabytes of data, spread across the World Wide Web. Problems that would take a single machine months to process take a matter of hours over this distributed model. Google s MapReduce library includes features such as load balancing and disk optimization to further enhance the efficiency of the system, as well as to simplify its use. It is also built to be robust so that machine failures do not have a negative impact on solving the original problem. In fact, according to Google s publicized research on MapReduce, it once lost 1,600 out of 1,800 machines in a cluster, but the system still produced a result at the end.

Can be used if your underlying database supports generating a unique identity for new rows. The persistence provider chooses an appropriate strategy, based on the type of the underlying database.

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