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The example code can be simplified using code blocks. The following rewritten implementation of StockTracerTraditional uses code blocks results. Source: /website/ROOT/ajaxrecipes/javascript/codeblocks.html function StockTracker( ticker, callback) { if( ticker == "YHOO") { callback( "Yahoo", 23, -1); } } The StockTrader function is rewritten, and the same decision block to find the ticker is used. What is new is the use of the callback that is called when a ticker is found. Consider what happens if the YHOO ticker is found: the callback is called with three parameters. If a code block were not used, then an object would have to be instantiated and returned to the caller. Because a code block is used, there is no need to verify if data is returned, as illustrated by the following caller code. Source: /website/ROOT/ajaxrecipes/javascript/codeblocks.html return_value : function() { StockTracker( "YHOO", function( company, close, change) { // Do something with the data info( "return_value", "Company=" + company + " close=" + close + " change=" + change); }); }, Calling StockTracker with the ticker to find as YHOO will result in the anonymous function being called. In the implementation of the anonymous function would be the code that is executed when data has been returned successfully. With code blocks, the caller does not have to implement a decision structure, because the anonymous function will be called only if the ticker exists. Code blocks are a means to an end, and do not imply that you should never use decision blocks or create loops with application logic. Code blocks provide a mechanism to simplify and decouple code from another. When you use code blocks, remember the following: Code blocks are like callbacks, except that code blocks promote the separation of logic, making pieces of code independent of each other. The advantage of code blocks is that they can process single results, multiple results, or no results. The calling code does not have to determine if the results worked. Using the dynamic nature of JavaScript, a function can process multiple parameters as a set. Code blocks can be used as an alternative to the return statement to send more complex data. As mentioned in Recipe 2-17, code blocks are the perfect way to return data to the caller without having to use a return type.
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2-14. Turning toSource into a Complete Serialization Solution
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You want a fix to turn toSource into a complete serialization solution.
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Mozilla has developed a very clever method called toSource. Using toSource, it is possible to serialize the state of an object into a buffer. Consider the following type declaration example. Source: /website/ROOT/ajaxrecipes/javascript/tosource.html function DefinedClass() { this.localvalue = 10; this.localmethod = function(param) { info("DefinedClass.localmethod", "called me"); } } The DefinedClass type has defined a localmethod method and a localvalue data member. When the type is instantiated, the instantiated type has a toSource method that can be called, as illustrated in the following source code. Source: /website/ROOT/ajaxrecipes/javascript/tosource.html var cls = new DefinedClass(); cls.prototypemethod.value = 100; info("mozilla_tosource", cls.toSource()); When toSource is called, the following buffer is generated: { localvalue:10, localmethod:(function (param) {info("DefinedClass.localmethod", "called me");}) } The generated buffer is a serialized form of an object instance. Missing from the serialization is the type definition. When the object instance is re-created, recreated is the state of the object. Yet this is not completely true, because the following prototype declaration is missed by toSource. Source: /website/ROOT/ajaxrecipes/javascript/tosource.html DefinedClass.prototype.prototypevalue = new StaticClass(); Anything that is declared via the DefinedClass.prototype property is missed by the toSource implementation. Missing the base properties and methods makes sense if the toSource buffer were to contain a reference to the type that created the instance. Yet there is no reference with missing methods and properties, and no support on any browser other than Mozilla/Firefox. So what is the use of toSource
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