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In the converted code scenarios are two functions: GenerateSeriesMod and ExampleSeriesSquareMod. The GenerateSeriesMod function still has two parameters: a maximum value and a callback function. The ExampleSeriesSquareMod function still uses an anonymous function. The difference is that the declaration of the array has moved from GenerateSeriesMod to ExampleSeriesSquareMod. This move of the array in this simple scenario is what makes the difference between a plain vanilla callback and a code block. Look at the details of GenerateSeriesMod and you will see that the implementation of GenerateSeriesMod only relates to requirements asked of it. The requirements are to generate a series of numbers that can be processed by an external functionality. The requirements do not state to create an array or create a buffer. The details of what to do with the generated series are implemented in the code block. Thus, two code blocks can be independent of each other, but together fulfill the needs of iterating and generating a series. In this example, it might seem like overkill to use a code block, but you will quickly realize that using code blocks is a great way to process data sets. For example, we have all encountered loops embedded within loops. Very quickly in this situation, the code becomes complex and hard to follow. Using code blocks, you can separate the code, and the embedded loops within loops are reduced to smaller, easily understood code chunks. Code blocks have an advantage in that they can process single results, multiple results, or no results. Looking at the implementation of GenerateSeriesSquared at the beginning of this recipe, an array is returned to the caller regardless of how many numbers are generated. The caller has to query the array and figure out if any numbers have been generated. In contrast, using a code block, the callback will be called only when a number is generated. The following code shows a more formal way of using a code block. Source: /website/ROOT/ajaxrecipes/javascript/codeblocks.html function CustomList() { this.array = new Array(); } CustomList.prototype.iterate = function( callback) { for( item in this.array) { callback( item); } } CustomList.prototype.addItems = function() { for( var c1 = 0; c1 < arguments.length; c1 ++) { this.array.push( arguments[ c1]); } } In the example, a CustomList class is being defined. The custom list has two functions: iterate and addItems. The addItems function is used to add an item to a list, and the iterate function iterates each of the elements in the loop and calls a callback. The callback parameter represents a code block. An example of using CustomList is as follows.
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Source: /website/ROOT/ajaxrecipes/javascript/codeblocks.html class_list_iterate : function() { var list = new CustomList(); list.addItems( "hello", "world"); list.iterate( function( item) { info( "class_list_iterate", item); }); }, CustomList is instantiated and assigned to the variable list. An item is added to the list using the addItems function. Notice that addItems is multiple-parameter-aware. Often in programming languages, you need to call the addItem method to add an item to a list as often as there are items. The addItems method is different in that you can specify as many parameters as you like, and each of those parameters represents a single item to add to the list. To iterate the list, a code block is defined, and in the implementation of the code block, the data can be processed however it pleases the caller. In this example, the items are output using the info method. Code blocks can also be used to generate and process return values. Let s consider an example that creates a function used to find the closing statistics of a stock ticker. Following is the implementation of the code using a traditional non-code-block approach: function StockTracerTraditional( ticker) { if( ticker == "YHOO") { var obj = new Object(); this.company = "Yahoo"; this.close = 23; this.change = -1; return obj; } return null; } function CallerStockTracer() { var obj = StockTracerTraditional( "YHOO"); if( obj != null) { info( "return_value", "Company=" + obj.company + " close=" + obj.close + " change=" + obj.change); } } The StockTracerTraditional function has a single parameter: the ticker to be found. If the ticker is found, an object is instantiated and the appropriate properties are assigned. Once the properties have been assigned, the instantiated object is returned. The CallerStockTracer function implementation calls StockTracerTraditional with the appropriate ticker, and the returned object instance is assigned to obj. Then a decision is made to verify if obj is null or not. If the ticker has been found, then obj will not be null and the object can be processed. Otherwise, the function returns without doing anything.
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