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String concatenation is a relatively common task in JavaScript especially when you need to dynamically inject HTML into a page via JavaScript. In such cases, plain old string concatenation can fast lead to very messy code. The Sys.StringBuilder class is somewhat similar to its .NET Framework counterpart (System.Text.StringBuilder) in that they both share similar method signatures for many of the methods. This class can also take in the initial string as its constructor. All methods are instance based and thus require an

An alternative to XML is JSON, which you can find at www.json.org. JSON is a text format that is language independent but that uses conventions similar to the C family of languages such as C, C#, JavaScript, and others. JSON is built on the following two data structures that are supported by virtually all modern programming languages: A collection of name/value pairs. In modern programming languages these are realized as an object, record, or dictionary. An ordered list of values, which is usually realized as an array. Since these structures are supported by so many programming languages, JSON is an ideal choice as a data interchange format between disparate systems. Additionally, since JSON is based on a subset of standard JavaScript, it should be compatible in all modern Web browsers. A JSON object is an unordered set of name/value pairs. The object begins with a { and ends with a }. A colon separates the name/value pairs. A JSON array is an ordered collection of values that begins with a [ and ends with a ]. A comma separates the values of the array. A value can be a string (enclosed in double quotes), a number, a true or false, an object, or an array. This allows structures to be nested. Figure 3-6 is a good visual guide for describing the makeup of a JSON object.

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postcondition allows you to verify that the method has been correctly executed. (From the user s perspective, the postcondition allows some assumptions about the values of that user s variables, so redundant tests can be avoided.) For instance, a square-root method (sqrt) would have the postcondition result>=0.

Appends a string to the end of the StringBuilder object Appends a new string with a line feed at the end of the StringBuilder instance Clears the contents of the StringBuilder object Boolean value indicating whether or not the StringBuilder object has any content Returns a string from the contents of a StringBuilder instance

Definition Class invariant An assertion that must be verified by the state of the class (in other words, by all the states of all the class instances). The class invariant guarantees that the objects remain in consistent states. For instance, a Triangle class would have the class invariant vertexes=3, where vertexes is either an attribute of the class or the result of a calculation on several attributes of the class.

Figure 3-6. Graphical representation of a JSON object structure (courtesy of www.json.org)

To see the Sys.StringBuilder class in action, take a look at the following function:

Definition Internal invariant An assertion that must be verified within the body of a method. The internal invariant helps to guarantee that the method is correctly implemented. For instance, in a method that simulates a loan calculation would have the internal invariant total interest ratio >=0.

function stringBuilderSample() { var sb = new Sys.StringBuilder("<html>"); sb.appendLine('<head></head>'); sb.appendLine('<body>'); sb.appendLine('<div align=center>'); sb.appendLine(' 4 - ASP.NET Ajax Client Libraries'); sb.append('</div>'); sb.append('</body></html>'); document.write(sb.toString()); }

Consider the simple example of an Employee object. An Employee object might consist of data such as a first name, last name, employee number, and title. Using JSON, you represent an instance of the Employee object like this:

A contract conflict occurs when one or several assertions are not verified. This conflict can arise for any reason, such as a hardware failure, the failure of a called routine, or a software bug that makes it impossible to satisfy the contract. In such cases, three strategies can be applied: Retrying: An alternative strategy is available. The contractors should restore the invariants and make another attempt using a different strategy. Organized panic: No alternative is available. The contractors must restore the invariants, terminate, and report failure to the user by triggering an exception. False alarm: It is possible to continue, maybe after some corrective measures are taken.

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