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Listing 5-16 is an example of the first First prototype. Listing 5-16. Sample Code Calling the First First Prototype string[] presidents = { "Adams", "Arthur", "Buchanan", "Bush", "Carter", "Cleveland", "Clinton", "Coolidge", "Eisenhower", "Fillmore", "Ford", "Garfield", "Grant", "Harding", "Harrison", "Hayes", "Hoover", "Jackson", "Jefferson", "Johnson", "Kennedy", "Lincoln", "Madison", "McKinley", "Monroe", "Nixon", "Pierce", "Polk", "Reagan", "Roosevelt", "Taft", "Taylor", "Truman", "Tyler", "Van Buren", "Washington", "Wilson"}; string name = presidents.First(); Console.WriteLine(name); Here are the results:

All prototypes of the GroupBy operator return a sequence of IGrouping<K, T> elements. IGrouping<K, T> is an interface defined as follows:

Adams You may be asking yourself how this operator differs from calling the Take operator and passing it a 1. The difference is the Take operator returns a sequence of elements, even if that sequence only contains a single element. The First operator always returns exactly one element, or it throws an exception if there is no first element to return. Listing 5-17 is some sample code using the second prototype of the First operator. Listing 5-17. Code Calling the Second First Prototype string[] presidents = { "Adams", "Arthur", "Buchanan", "Bush", "Carter", "Cleveland", "Clinton", "Coolidge", "Eisenhower", "Fillmore", "Ford", "Garfield", "Grant", "Harding", "Harrison", "Hayes", "Hoover", "Jackson", "Jefferson", "Johnson", "Kennedy", "Lincoln", "Madison", "McKinley", "Monroe", "Nixon", "Pierce", "Polk", "Reagan", "Roosevelt", "Taft", "Taylor", "Truman", "Tyler", "Van Buren", "Washington", "Wilson"}; string name = presidents.First(p => p.StartsWith("H")); Console.WriteLine(name); This should return the first element in the input sequence that begins with the string "H". Here are the results:

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public interface IGrouping<K, T> : IEnumerable<T> { K Key { get; } } So, an IGrouping is a sequence of type T with a key of type K. There are four prototypes we will cover.

import javax.faces.render.RenderKitFactory; import javax.faces.context.FacesContext; import javax.faces.context.ExternalContext; /** * The ApplicationBean returns a dynamic RenderKit identifier, based on * the value of the User-Agent request header. */ public class ApplicationBean { public String getRenderKitId() { FacesContext context = FacesContext.getCurrentInstance(); ExternalContext external = context.getExternalContext(); Map requestHeaders = getRequestHeaderMap(); String userAgent = (String) requestHeaders.get("User-Agent"); // // // if { Mozilla Firefox 1.0.7 Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7 (userAgent.indexOf("Gecko/") != -1)

public static IEnumerable<IGrouping<K, T>> GroupBy<T, K>( this IEnumerable<T> source, Func<T, K> keySelector); This prototype of the GroupBy operator returns an object that when enumerated, enumerates the input source sequence, calls the keySelector method, collects each element with its key, and yields a sequence of IGrouping<K, E> instances, where each IGrouping<K, E> element is a sequence of elements with the same key value. Key values are compared using the default equality comparer, EqualityComparerDefault. Said another way, the return value of the GroupBy method is a sequence of IGrouping objects, each containing a key and a sequence of the elements from the input sequence having that same key. The order of the IGrouping instances will be in the same order that the keys occurred in the source sequence, and each element in the IGrouping sequence will be in the order that element was found in the source sequence.

Remember, if either prototype of the First operator ends up with no element to return, an InvalidOperationException is thrown. To avoid this, use the FirstOrDefault operator.

public static IEnumerable<IGrouping<K, T>> GroupBy<T, K>( this IEnumerable<T> source, Func<T, K> keySelector, IEqualityComparer<K> comparer); This prototype of the GroupBy operator is just like the first except instead of using the default equality comparer, EqualityComparerDefault, you provide one.

return "com.apress.projsf.xul.ajax"; } // MS Internet Explorer 6.0 // Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0) else if (userAgent.startsWith("Mozilla") && userAgent.indexOf("MSIE") != -1) { return "com.apress.projsf.htc.ajax"; } // Safari // Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-us) // AppleWebKit/XX (KHTML, like Gecko) Safari/YY else if ((userAgent.indexOf("AppleWebKit") != -1) || (userAgent.indexOf("Safari") != -1)) { return "com.apress.projsf.html.ajax"; } else { // default to standard HTML Basic for PDAs, etc. return RenderKitFactory.HTML_BASIC_RENDER_KIT; } } }

The FirstOrDefault operator is similar to the First operator except for how it behaves when an element is not found.

public static IEnumerable<IGrouping<K, E>> GroupBy<T, K, E>( this IEnumerable<T> source,

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