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de nes a single method compareTo Our IComparable interface is displayed in Listing 29
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Listing 29 Defining an Interface
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IComparable = function() { }; IComparableprototype = { compareTo: function(obj) {throw ErrornotImplemented(); } }; IComparableregisterInterface("IComparable");
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First, IComparable s type declaration takes no parameters Because interfaces do not maintain state themselves, private members aren t allowed, and therefore there is no need for function parameters Second, the constructor method does not call initializeBase as we did in the class s constructor Interfaces cannot inherit from another interface, so there is no possibility of a base class or base interface Moving to the public interface declaration, the single compareTo function throws the prede ned notImplemented error In the NET Framework, there is no method body when we declare an interface method, just the method s signature However, there is no equivalent code construct in JavaScript, where we can just declare a method s signature, so we re forced to include a method body Because we re forced to include a method body, we need to ensure that if the method is called directly on the interface versus an implementation of the interface that we throw an error Finally, when we register our interface, we use the registerInterface method that is available on the Function type The registerInterface method takes a single parameter, which is the name of the interface To test our new IComparable interface, we apply it to a couple of test classes: Book and Newspaper Then, we create a bubbleSort function that is designed to sort any array whose items implement IComparable To test our bubbleSort method, we create a list of Books and a list of Newspapers and sort them using the method To start, Listing 210 de nes our Book and Newspaper types
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Listing 210 Defining Book and Newspaper
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// Book Declaration Book = function(text) { this_text = text; }; Bookprototype = { get_text: function() { return this_text; }, // compare a book to another book // returns -1 if this book text's length is less than obj // returns 0 if the book text's length is the same as obj // returns 1 if the book text's length is the greater than obj compareTo: function(obj) { var objLen = objget_text()length; var thisLen = thisget_text()length; if (thisLen === objLen) { return 0; } else if (thisLen > objLen) { return 1; } return -1; }, toString: function() { return this_text; } }; BookregisterClass("Book", null, IComparable); // Newspaper Declaration Newspaper= function(numberOfPages) { this_numberOfPages = numberOfPages; }; Newspaperprototype = { get_numberOfPages: function() { return this_numberOfPages; }, // compare a newspaper to another newspaper // return -1 if this newspaper's number of pages is less than obj // return 0 if they're the same // return 1 if this newspaper's number of pages is greater than obj compareTo: function (obj) { var objPages = objget_numberOfPages(); if (this_numberOfPages === objPages) { return 0; } else if (this_numberOfPages > objPages) { return 1; } return -1; }, toString: function () { return this_numberOfPages; } } NewspaperregisterClass("Newspaper", null, IComparable);
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Both types implement the IComparable interface and its compareTo function The compareTo function rudimentarily compares one instance to another and returns the numeric value -1, 0, or 1 With our types de ned, we can craft our generic bubbleSort function, which is shown in Listing 211
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Listing 211 Defining the bubbleSort method
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// sorts anything that implements IComparable function bubbleSort(toSort) { var sortedArray = []; for (var i=0; i< toSortlength; i++) { var itemToSort = toSort[i]; // test to make sure that IComparable is supported if (!IComparableisImplementedBy(itemToSort)) { throw ErrorinvalidOperation( "Item does not implement IComparable"); } for (var j=0; j<sortedArraylength; j++) { var itemToCompare = sortedArray[j]; if (itemToSortcompareTo(itemToCompare) < 0) { break; } } Arrayinsert(sortedArray, j, itemToSort); } return sortedArray; }
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Our bubbleSort function works like a normal bubble sort and iterates through the toSort array, creating a sorted array as it processes each item When it pulls an item to sort out of the array, it checks to make sure that it implements the IComparable interface by using the isImplementBy method If the item fails to be implemented by IComparable, an invalidationOperation error is created and thrown When the sort enters the inner loop, it executes the compareTo method on the itemToSort until it either nds an element that it is less than itself or runs out of items to compare, which means the itemToSort goes at the end of the list
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