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CHAPTER 2 JAVASCRIPT RECIPES
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For example, imagine you are writing a mortgage application, and you are currently creating a client. The client has a certain age, address, and profile. In a traditional programming environment, you would associate the state with an object each and every time the state is loaded. This means each time the state is loaded, you have to execute various Builder pattern implementations to create the appropriate object type. Using JavaScript, this is not necessary because the state of the object, including methods, could be serialized. This makes it possible to serialize a complete object, store it into a database, or execute it in another context. Dynamic functions need to use value types, which means CallMeReference has to be modified as follows: function CallMeValue( toCall, value) { return eval( "function() { var func = " + toCall.toString() + "; func( '" + value.toString() + "'); } "); } The CallMeValue function is like CallMeReference, except that it serializes the function and value to string buffers that are concatenated and executed. The result of the execution is a function that when serialized generates the following buffer: function () { var func = (function (param) {info("param is (" + param + ")");}); func("hello world"); } The serialized function behaves exactly like the function created in CallMeReference, but the value function can be serialized and executed on another computer or in another context. When writing code that dynamically wires together code, you need to think about whether to use reference or value programming techniques. When writing such code, consider the following rules of thumb: Reference duck types should be considered as transient types that live only for the extent of the JavaScript execution (e.g., an HTML page). Reference duck types are created using the Builder pattern. Once created, reference duck types have a slight performance advantage, as they do not need the overhead of running the eval statement in the Builder pattern implementation. Reference duck types can share instances with multiple object instances because you are assigning references. Value duck types should be considered as long-term serializable objects where the state and code can be serialized. Value duck types are created using the Builder pattern. Value duck types are slightly slower than reference duck types because the code is the result of serializing, building a buffer, and then evaluating the buffer. Value duck types do not have the side effect of having functions behave irregularly because of assigned object instances. Each call to a value duck type Builder pattern results in a clean-slate approach, where the variables are assigned the state given to the Builder pattern.
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CHAPTER 2 JAVASCRIPT RECIPES
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2-9. Implementing JavaScript Generics
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You want to implement generics in JavaScript.
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Programming languages such as Java and C# have a programming concept called generics. The idea behind generics is to write code in such a way that an identifier is defined as a general type that is manipulated in a class or method. For example, the following code would be a generic class in either Java or C#: class Container<Type> { Type _managed; } The Container class has a generic parameter, Type, which can reference any other type. And in the declaration of Container, the _managed data member is the same type as the generic parameter. In an abstract notion, Container manages any type. A JavaScript programmer might look at the code and think, Hey, I have this already in JavaScript! Here is the same code, this time in JavaScript: function Container() { this._managed = /* whatever type */ } As illustrated in Recipe 2-8, you can have reference-based duck typing or value-based duck typing. Implementing generics for JavaScript is like implementing a preprocessor, thus we want value-based duck typing. The following code example shows what can go wrong when you mix value and reference duck typing together: proxy : function(instance, funcIdentifier, newFunc) { if (!instance[funcIdentifier]) { throw new Error("Cannot proxy nonexistent method(" + funcIdentifier + ")"); } eval( "var generatedOrigFunc = " + instance[funcIdentifier].toString()); eval( "var generatedProxyFunc = " + newFunc.toString()); instance[funcIdentifier] = function() { var origFunc = generatedOrigFunc; var proxyFunc = generatedProxyFunc; var args = new Array(); for (var c1 = 0; c1 < arguments.length; c1 ++) { args.push(arguments[c1]); } args.push(origFunc); args.push(arguments); proxyFunc.apply(this, args); } },
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