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This AddNumbers method doesn t know up front what will be in the array it creates it s building a modified copy of an existing array. So instead of creating a fixed list of items, it uses this syntax: new ElementType[arrayLength]. This specifies the two things that are fixed when you create a new array: the type and number of elements. When you create an array with this minimal syntax, the elements all start out with their default values. With the string type used here, the default is null; an array of numbers created this way would contain all zeros. So Example 7-3 immediately goes on to populate the newly created array with some useful values. In fact, that s also what happened in Example 7-1 when you provide an array with a list of initial contents, the C# compiler turns it into the sort of code shown in Example 7-4.

string[] eventNames = new string[5]; eventNames[0] = "Swing Dancing at the South Bank"; eventNames[1] = "Saturday Night Swing"; eventNames[2] = "Formula 1 German Grand Prix"; eventNames[3] = "Swing Dance Picnic"; eventNames[4] = "Stompin' at the 100 Club";

The array initialization syntax in Example 7-1 is really just convenient shorthand the .NET Framework itself always expects to be told the number and type of elements, so it s just a matter of whether the C# compiler works out the element count for you. The Example 7-1 shorthand works only at the point at which you declare a variable. If your program decides to put a new array into an existing variable, you ll find that the syntax no longer works (see Example 7-5).

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his appendix shows the full source code listing for the password manager and password file classes used in 9. (Note that all of the source code used in the book is also available at www.learnsecurity.com/ntk.) In the listing that follows, we include code for two versions of a password file class. The HashedPasswordFile class stores passwords that are simply hashed using SHA-256. The HashedSaltedPasswordFile class stores a salted hash of the password. The init() and flush() methods in MiniPasswordManager can be modified to specify which version of the password file class should be used. Of course, the add() and checkPassword() methods need to be modified to match as well. Finally, please note that this code is meant for instructional purposes only (and can be exploited; see, for example, exercise 6 in 11); do not use this code as-is in a real system. /*********************************************************************** MiniPasswordManager.java Copyright (C) 2006 Neil Daswani This class implements a MiniPasswordManager that can be used by other applications. You must call init() prior to calling checkPassword(), or add(). This file is also available at http://www.learnsecurity.com/ntk ***********************************************************************/ package com.learnsecurity; import java.util.*; import java.io.*; import java.security.*; public class MiniPasswordManager { /** dUserMap is a Hashtable keyed by username, and has HashedPasswordTuples as its values */ private static Hashtable dUserMap;

// Won't compile! eventNames = { "Dean Collins Shim Sham Lesson", "Intermediate Lindy Hop Lesson", "Wild Times - Social Dancing at Wild Court" };

The reasons for this are somewhat arcane. In general, C# cannot always work out what element type you need for an array, because it may have more than one choice. For example, a list of strings doesn t necessarily have to live in an array of type string[]. An array of type object[] is equally capable of holding the same data. And as we ll see later, initializer lists don t necessarily have to initialize arrays this list of strings could initialize a List<string>, for example. As it happens, only one of those choices would work in Example 7-5 we re assigning into the eventNames variable, which is of type string[], so you d think the compiler would know what we want. But since there are some situations which really are ambiguous, Microsoft decided to require you to specify the element type everywhere except for the one special case of initializing a newly declared array variable. The upshot is not so bad if you specify the element type, you still get to use the initializer list syntax and have C# count the elements for you. Example 7-6 modifies Example 7-5 by explicitly stating the type of array we d like before providing its contents. By the way, we could also have added this explicit array type in Example 7-1 it would have worked, it s just more verbose than necessary in that particular case.

// Will compile! eventNames = new string[] { "Dean Collins Shim Sham Lesson", "Intermediate Lindy Hop Lesson", "Wild Times - Social Dancing at Wild Court" };

This syntax works anywhere you need an array-typed expression. For example, we could use this to pass in an array to the AddNumbers method in Example 7-3, as shown in Example 7-7.

This operation is defined with one parameter. search. It will contain the keywords entered into the block and passed into the API search function. As you look into the code of the getSearchResults JavaScript function (see Listing 9-2), you will notice several variables created to store parts of the URL that we need to create when calling the search operation. Note that you need to insert your personal API key for [YOUR API KEY]. There is some commented code next to the apiKey variable that will be used when we define the block in XML; it is a lookup used by the Popfly environment to retrieve the API key entered by the mashup creator. For testing purposes, we are going to insert our API key directly into the code.

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